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Week 5 · Assignment: Traditional alternative (no AI)

Week 5 — A Window, Not a Deadline: Reading Motor Milestones and Safe Sleep — Traditional alternative (no AI)

Child Development Free sample edition
Traditional alternative (no AI), unpublished. In the course this is a separate assignment that ships unpublished beside the adaptive assignment: same objective, no AI. An instructor who prefers it publishes it and unpublishes or deletes the adaptive one, as the note at its top says.

Instructors: publish this instead of the adaptive version if you prefer, and unpublish or delete the adaptive one.

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 week you met the infant brain, the six newborn reflexes, gross and fine motor skills, the WHO windows of achievement, safe sleep as the American Academy of Pediatrics states it, and the World Health Organization's feeding recommendation. In this assignment you work four short problems, interpret each one, and explain the safe sleep guidance to someone who has it wrong. This week's lecture tutorial, quiz, discussion, and Child Observation Workshop practice the same ideas from other angles. 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 check your draft, 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.

Deliverables

Submit a single report containing:

  • the four counts, each with the endpoints or years and the arithmetic shown, and the brief interpretation the task names for that problem;
  • your message to the grandparent, explaining the American Academy of Pediatrics' 2022 guidance and that sleeping better does not change it, with one limit;
  • your reflection, on the option you chose; and
  • a one-line restatement of the endpoints and years you used, so your counts can be checked.

Keep it to roughly one page. Clear and correct beats long.

Choose how you show it. Present your report as written text, or as a recorded audio or video explanation of about three minutes with a transcript, or as a labelled sketch of the windows with a short explanation. Every form is graded by the same scoring criteria. 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.

How you'll be graded

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

Academic integrity and AI use

This version is designed to be completed without AI: do the counts, the interpretations, and the writing yourself, without any AI tool. You may use a calculator or a spreadsheet for the arithmetic. Describe records R2 and R3 only as the course describes them, name people only by role, write every age as a range rather than a deadline, never judge a real child as ahead or behind, and state the safe sleep guidance only as the American Academy of Pediatrics states it. Submitting AI-generated work as your own, or copying another student's work, is an integrity violation under the course policy.

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