Newborn Guide
Newborn Guide

Newborn Week 3: Development, Sleep & What to Expect

👶

Week 3 of 12  ·  Month 1

Growth spurt commonly occurs at 3 weeks. Baby may feed constantly for 24–48 hours.

Development This Week

  • First genuine social smiles beginning to emerge
  • More eye contact during alert periods
  • Colic can peak this week (3+ hrs crying for 3+ days)
  • Stronger grip reflex

Sleep

Total Sleep15–17 hrs
NoteStill no circadian rhythm — night/day confusion is normal

Feeding

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8–12 feeds

feeds per day — feed on demand, watch for hunger cues

What to Expect

📋 This Week

Growth spurt commonly occurs at 3 weeks. Baby may feed constantly for 24–48 hours.

💡 Parent Tip

If colic is severe, try the 5 S's: Swaddle, Side/Stomach position (while awake and held), Shush, Swing, Suck.

Science Fact

🔬 Did You Know?

Colic affects 10–40% of infants and peaks around week 6, resolving spontaneously by 3–4 months. The exact cause is unknown, but gut microbiome immaturity plays a role.

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Development Sleep Feeding What to Expect Science Fact
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