Week 5 — Infancy and Toddlerhood: Physical Development

Why this matters

A nurse at a well-baby visit and an infant-room teacher at a childcare center both read babies' milestones as ranges, not deadlines.

In plain language

This chapter is about how babies' bodies and brains grow in the first two years. The brain builds connections fast, keeps the ones a child uses, and trims the rest, which is called synaptic pruning (removing unused links between nerve cells). Newborns arrive with reflexes (automatic movements nobody taught them), and over the next months they learn to sit, crawl, stand, and walk. You will read each new skill against a window of achievement (the range of ages in which most children in a large study reached it), not against one magic birthday. You will also learn what two health bodies say about safe sleep and infant feeding, stated their way and never as advice for one baby.

• Already covered: Week 4's prenatal periods, birth, and the Apgar score.
• This week: the brain, reflexes, motor skills, the WHO windows, safe sleep, feeding.
• How they connect: this week follows the same newborn's body into the first two years.
• Where we're going next: Week 6, cognitive and language development.

Focus

How do babies' bodies and brains grow in the first two years, and how do you read a milestone fairly?

By the end of this module, you should be able to:

• [ ] describe synapses, pruning, myelination, and plasticity
• [ ] name the six newborn reflexes
• [ ] tell gross motor skills from fine motor skills
• [ ] read a milestone against its WHO window as a range
• [ ] state safe sleep as the AAP's 2022 statement does

To-do

Plan your week

1. Read Chapter 5 (~35–45 minutes), then the lecture and slides.
2. Work the lecture tutorial (60–90 minutes).
3. Try the practice set (15–25 minutes).
4. Do the workshop (about 90 minutes), the discussion, and the assignment, then the quiz.

This week's checkpoint: read a baby's walking age against the WHO window as a range, not a deadline.

You've got this

Take it in order, and ask your instructor if a step snags.

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