Week 5 — A Window, Not a Deadline: Reading Motor Milestones and Safe Sleep

Assignment 5 of the term — work the WHO motor windows and the safe sleep campaign years, read the running case's records against them, and explain the safe sleep guidance to someone who has it wrong.

This adaptive assignment uses a coaching dialogue to help you turn a first attempt into a clear, evidence-based report. You remain the author. The coach asks questions, checks the reasoning you show, and waits for you to revise before it produces the required report. This week's lecture tutorial, quiz, discussion, and Child Observation Workshop practice the same ideas from other angles; this assignment is where you put them together. It builds on Week 3's habit of keeping what a child did apart from what it might mean, and on Week 4's newborn, whose record R1 opens the running case.

The task

The WHO Multicentre Growth Reference Study Group (2006) reported, for six gross motor milestones, a window of achievement: the age range, in months, from the 1st to the 99th percentile of the age at which children in its Motor Development Study reached the milestone. The running case is an illustrative, unnamed child built for this course; it describes no real child. Record R2 was written at 9 months in the family home: the infant sits without support and crawls on hands and knees. Record R3 was written at 14 months at a childcare center: the toddler walks alone.

A grandparent who is helping with a new baby (illustrative) says, "We always put babies to sleep on their stomachs, and they slept better that way." Your job is to answer the way a child development student would, starting from a few plain numbers.

Work these four problems, showing your arithmetic:

1. The WHO window of achievement for sitting without support runs from 3.8 months (the 1st percentile) to 9.2 months (the 99th percentile). How many months wide is the window?
2. The WHO window of achievement for hands-and-knees crawling runs from 5.2 months (the 1st percentile) to 13.5 months (the 99th percentile). How many months wide is the window?
3. The WHO window of achievement for walking alone runs from 8.2 months (the 1st percentile) to 17.6 months (the 99th percentile). How many months wide is the window?
4. The NICHD launched the Back to Sleep campaign in 1994 and expanded and renamed it the Safe to Sleep campaign in 2012. How many years passed between the two launches?

Beside each count, add one brief interpretation:

• Problem 1: place record R2's sitting without support at 9 months inside the sitting window, writing what the infant did apart from what it might mean, and explain that a window is a range of typical ages for a group of children, not a deadline.
• Problem 2: place record R2's hands-and-knees crawling at 9 months inside the crawling window, and explain that crawling is common but not a required step before walking, since some children skip it.
• Problem 3: place record R3's walking alone at 14 months inside the walking-alone window, and say which is wider, the walking-alone window or the sitting window, and what that shows about later milestones.
• Problem 4: state the American Academy of Pediatrics' 2022 safe sleep guidance as the body states it: place babies on their backs for every sleep, for all naps and at night, until age 1, on a firm, flat, non-inclined surface.

Explain it to a non-expert

Write a 3–5 sentence message to the grandparent. Explain, in everyday words, what the American Academy of Pediatrics' 2022 statement says, that a baby who "sleeps better" on the stomach does not change it, and that the NICHD has carried the back-to-sleep message since its Back to Sleep campaign. Name one limit, such as that this course states the guidance as the issuing body states it and that questions about one baby belong with that family's health professional. Be respectful: the grandparent cared for babies the way many families once did. More than one good message is possible.

For a different, ungraded example, imagine a friend who planted bean seeds and worries on day 8 because the packet says "sprouts in 7 to 14 days." Model message: "The packet gives a range, not a promise for one seed, because seeds in the same packet sprout at different times. Day 8 is well inside that range, so there is no reason to dig them up yet. One fair caveat: the packet's range comes from the grower's tests, so it tells you what is typical, not what any one seed will do."

Use that pattern for the grandparent, with your own wording and evidence.

Your reflection. After you revise, write two or three sentences on one of these, your choice: (a) which problem changed how you would talk about a baby's milestones, and why; or (b) which word or phrase in your first draft you replaced, and what the new wording gets right.

Part 1 — Student instructions

1. Draft all four counts, the four brief interpretations, and your message to the grandparent before opening a chatbot.
2. Open any course-approved chatbot. Copy the entire Coach Prompt box, including its first and last marker lines, and paste it as one message. The coach will ask for your draft and then work one question at a time.
3. Answer in your own words. Show calculations when asked. Use the coach's feedback to revise at least one calculation or explanation, even if your first attempt was correct.
4. Continue until the prompt's exit condition is met, and write your reflection.
5. Save the chat's share link and copy the final report exactly as the coach gives it.

The chatbot is a coach, not a ghostwriter. It must draw out your reasoning rather than write the work for you.

Coach Prompt

COPY EVERYTHING BELOW THIS LINE
ROLE: You are a careful learning coach for an introductory child development course. Draw out and challenge MY thinking about infant physical development: the WHO windows of achievement for gross motor milestones, the running case's records, and safe sleep as the American Academy of Pediatrics states it. Do not write my assignment for me, do not invent work I did not show, never invent an age norm, a study, a statistic, a quotation, or a health guideline, write every age as a range rather than a deadline, never judge any real child as ahead or behind, and never give medical advice about a real baby.

ASSIGNMENT: Work through these four problems in order, one at a time. Do not invent, replace, or reorder a problem. The data: the WHO Multicentre Growth Reference Study Group (2006) windows of achievement, each the age range in months from the 1st to the 99th percentile of the age at which children in its Motor Development Study reached a milestone; the running case, an illustrative child built for this course, whose record R2 (9 months, family home) sits without support and crawls on hands and knees, and whose record R3 (14 months, childcare center) walks alone; and the American Academy of Pediatrics' 2022 safe sleep guidance: place babies on their backs for every sleep, for all naps and at night, until age 1, on a firm, flat, non-inclined surface.
PROBLEM P1: The WHO window of achievement for sitting without support runs from 3.8 months (the 1st percentile) to 9.2 months (the 99th percentile). How many months wide is the window?
PROBLEM P2: The WHO window of achievement for hands-and-knees crawling runs from 5.2 months (the 1st percentile) to 13.5 months (the 99th percentile). How many months wide is the window?
PROBLEM P3: The WHO window of achievement for walking alone runs from 8.2 months (the 1st percentile) to 17.6 months (the 99th percentile). How many months wide is the window?
PROBLEM P4: The NICHD launched the Back to Sleep campaign in 1994 and expanded and renamed it the Safe to Sleep campaign in 2012. How many years passed between the two launches?
After the four counts, I must briefly interpret each one: for P1, R2's sitting placed inside the sitting window with behavior written apart from interpretation, plus a window as a range for a group, not a deadline; for P2, R2's crawling placed inside the crawling window, plus crawling as common but not required; for P3, R3's walking alone placed inside the walking-alone window, plus which window is wider and what that shows; for P4, the American Academy of Pediatrics' 2022 safe sleep guidance stated as the body states it. I must then write a 3-5 sentence message to a grandparent who says stomach sleeping helped babies sleep better, explaining the guidance and that sleeping better does not change it, with one limit. I must explain technical terms in everyday words, and then write a short reflection on my revision.

SCORING CRITERIA: Score only evidence I supply: working the windows and the campaign years (40 points), reading the records and the guidance (32 points), clarity for a non-expert reader (16 points), and showing work so it can be checked (12 points). For each of P1-P4, give 2, 1, or 0 evidence units per criterion; one unit is worth 5 working points, 4 reading points, 2 clarity points, or 1.5 showing-work points. Sum all four problems within each criterion. Count my message to the grandparent only with P4, not again with P1-P3.
WORKING UNITS: A correct window width or year count = 2; the right endpoints or years and operation with only an arithmetic slip = 1; a missing count or the wrong endpoints, years, or operation = 0. Do not penalize an alternative valid method or equivalent correct notation.
READING UNITS: For P1-P3 separately, an interpretation that meets both parts named for that problem = 2; exactly one part = 1; neither = 0. For P4, BOTH the 2022 guidance stated as the American Academy of Pediatrics states it AND a message to the grandparent that keeps the guidance unchanged and names a limit = 2. If full P4 evidence is absent but at least one accurate substantive part appears, give 1. No accurate reading = 0; naming a term alone does not earn a unit, and an age stated as a deadline, a real child judged as ahead or behind, crawling called required, or stomach sleeping called acceptable is not accurate. An arithmetic slip alone is not a reading error.
CLARITY UNITS: For each problem, labeled evidence understandable to someone new to child development, with technical terms explained = 2; intelligible evidence that needs rereading because of ambiguity or jargon = 1; absent or unintelligible evidence = 0. Include the message to the grandparent with P4 if submitted. Missing reasoning alone does not lower clarity for otherwise clear submitted work.
SHOWING-WORK UNITS: For each problem, checkable endpoints or years and steps = 2; a relevant but incomplete endpoint, year, or step = 1; a bare final number or no method = 0. A visible method stays checkable despite an arithmetic slip.

Do NOT invent grading rules.

DIALOGUE RULES: Ask exactly one question per message and wait for my reply. Start by asking for my complete first attempt. Build each next question from my exact words. Probe an unsupported claim and ask me to examine its evidence. Keep the conversation focused on questions rather than completed work.

ENGAGEMENT GUARDS: A greeting, copied prompt, yes/no reply, or one-word reply is not a substantive exchange. Do not flatter or accept agreement as evidence. Praise only a concrete move I made. If evidence is missing, say what is missing and ask for it. Require a real revision plus a short reflection on why the revision is better. Do not issue the report early.

EXIT CONDITION: Continue until at least five substantive exchanges have occurred AND I have supplied all four counts and their brief interpretations AND written my message to the grandparent AND revised at least one calculation or explanation AND reflected on the revision. Stop only after whichever requirement happens last.

REPORT: After the exit condition is satisfied, output exactly these labelled lines in this order. Replace X with the exact earned score; it may end in .5 and must not be rounded to a whole number. Base every line only on evidence in this chat; write "Not supplied" for missing evidence and never raise the score for polished chatbot prose.
STUDENT'S SCORE: X/100
EVIDENCE FOR THE SCORE: [specific evidence from my counts and reasoning]
REVISION MADE: [what I changed and why]
STRENGTH: [one earned strength]
NEXT STEP: [one concrete improvement]
Then tell me to submit this report, my revised work, and the share link.
COPY EVERYTHING ABOVE THIS LINE

Deliverables

Submit these three items in the assignment entry:

• your revised work with all four counts, their brief interpretations, your message to the grandparent, and your reflection — written, or recorded as audio or video with a transcript, or as a labelled sketch of the windows with a short explanation; every form is graded by the same scoring criteria;
• the coach's five-line report; and
• the conversation share link.

Submit in any accessible file type or as a link; a recorded response may be submitted as audio or video with a transcript, or as text.

Equivalent route (no AI required)

This route assesses the same Week 5 skills — working the WHO windows of achievement, reading the running case's records R2 and R3 inside those windows as ranges rather than deadlines, keeping what a child did apart from what it might mean, and stating the American Academy of Pediatrics' 2022 safe sleep guidance as the body states it — for comparable time and effort, about 60 to 90 minutes, the same as the coached route. Complete the same four problems, the four brief interpretations, the message to the grandparent, and the reflection. Then audit your own first draft against the attached scoring criteria, criterion by criterion, and write a second draft. Add a 150–200 word revision memo that names one count or explanation you changed, the evidence that prompted the change, and one question you still have about the windows or the guidance. Submit the revised work, your completed criteria checklist, and the revision memo in the assignment entry; together they replace the share link and the coach's report. This route uses the same scoring criteria and the same points, with no penalty for choosing it.

How you'll be graded

The full analytic rubric is attached to this assignment in Canvas.

Academic integrity and AI use

The counts, reasoning, revision, and final report must be your own. Do not ask the chatbot to create the assignment or add evidence you did not produce, and do not let it state a milestone age as a deadline, judge a real child as ahead or behind, call crawling required, or call stomach sleeping acceptable for a baby who sleeps better. Submit an honest share link from your own dialogue. The equivalent route keeps the same workload and evidence and requires no AI account.

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