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Month 4

Mental Development

  • Babble regularly, using rhythms and inflections
  • Display curiosity about new things and sensations

Visual Development

  • Respond to a full range of colours and shades
  • Be able to follow faster movements with their eyes
  • See nearby objects and reach for them


  • Weigh about 6.4 kg if she’s a girl or about 7.0 kg if he’s a boy
  • Be about 62.1 cm tall if she’s a girl or about 63.9 cm tall if he’s a boy

Motor Development

  • Be able to hold up their head and chest while using their elbows for support
  • Be able to bring their thumbs and small objects to their mouth
  • Be able to hold their head steady while being pulled to a sitting position
  • Start to roll over from stomach to back

Social and Emotional Development

  • Start to show dislikes by turning away from unwelcome things
  • Have a variety of facial expressions to show their feelings

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