Newborn Third Week Guide

Your baby's third week: Growing alertness, developing personality, and strengthening bonds

14-21 days
Age Range
8-12
Feeds per day
14-17 hrs
Sleep per day
6-8
Wet diapers/day

Week 3 Development Highlights

Visual Development

  • • Can focus on objects 8-12 inches away
  • • Shows preference for high contrast patterns
  • • May briefly track moving objects
  • • Increased eye contact during feeds

Motor Skills

  • • Better head control during tummy time
  • • Stronger grip reflex
  • • More coordinated arm movements
  • • Can lift head briefly when prone

Feeding Patterns - Week 3

Feeding TypeFrequencyAmount/DurationNotes
Breastfeeding8-12 times/day15-30 minutesMore efficient feeding, longer intervals between feeds
Formula8-10 times/day2-4 oz per feedMay go 3-4 hours between feeds

Growth spurt alert: Around week 3, many babies experience a growth spurt. This means more frequent feeding for 2-3 days is normal.

Sleep Development - Week 3

Sleep Patterns

  • • Total sleep: 14-17 hours per day
  • • Longest stretch: 3-5 hours at night
  • • Daytime naps: 3-4 naps of 1-3 hours
  • • Beginning to distinguish day/night

Sleep Improvements

  • • Slightly longer sleep cycles
  • • More predictable wake windows
  • • Better self-soothing attempts
  • • May sleep for longer periods after feeds

Communication & Social Development

New Behaviors This Week

  • • More sustained eye contact
  • • May smile in response to stimulation
  • • Increased vocalizations and cooing
  • • Shows recognition of familiar voices
  • • More alert periods during the day
  • • Beginning to show preferences
  • • Responds to gentle talking
  • • May calm when picked up

Physical Changes & Milestones

Growth

  • • Weight gain: 150-200g
  • • Length increase: 0.5-1 inch
  • • Head circumference growth
  • • Filling out appearance

Reflexes

  • • Stronger grasp reflex
  • • Rooting still present
  • • Moro reflex continuing
  • • Improved muscle tone

Appearance

  • • Umbilical cord may fall off
  • • Skin less wrinkled
  • • Hair may start changing
  • • More alert facial expressions

Common Challenges & Solutions

Growth Spurts

Around 2-3 weeks, babies often have a growth spurt with increased feeding demands.

Solution: Feed on demand, rest when possible, and remember it's temporary (2-3 days).

Overstimulation

Babies become more aware and can get overwhelmed by too much stimulation.

Solution: Watch for tired cues, create calm environments, and allow quiet time.

Evening Fussiness

Many babies become fussier in the evenings as their nervous system develops.

Solution: Try swaddling, gentle movement, white noise, or skin-to-skin contact.

Essential Care Tips

Tummy Time

Start with 2-3 minutes several times daily while baby is awake and supervised.

Bonding Activities

Talk, sing, and make eye contact during feeds and diaper changes.

Routine Building

Begin gentle routines for bedtime to help establish day/night patterns.

Self-Care

Accept help, rest when baby sleeps, and don't hesitate to ask for support.

When to Contact Your Pediatrician

Urgent Signs:

  • • Fever over 100.4°F (38°C)
  • • Difficulty breathing
  • • Persistent vomiting
  • • No wet diapers for 12+ hours
  • • Extreme lethargy

Monitor Closely:

  • • Poor feeding for 24+ hours
  • • Unusual crying patterns
  • • Signs of dehydration
  • • Rash or skin changes
  • • Any concerning behavior

Looking Ahead: Week 4

Next week, you can expect even more personality to emerge, with possible first social smiles, improved head control, and longer periods of alertness.

First Social Smile
May appear around 4-6 weeks
Better Head Control
During tummy time
Longer Wake Periods
More interaction time

Related Resources