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Month 5

Mental Development

  • Begin to understand cause and effect
  • Spend more time examining objects
  • Start to understand simple games

Visual Development

  • Be able to pay attention to a very small object
  • Move their head and eyes when they notice activity
  • Have both eyes working together


  • Weigh about 6.9 kg if she’s a girl or about 7.5 kg if he’s a boy
  • Be about 64.0 cm tall if she’s a girl or about 65.9 cm tall if he’s a boy

Motor Development

  • Hold their head steady when upright
  • May move short distances by rocking on their stomach, kicking their legs, and swimming with their arms
  • Reach for objects
  • Grab their own toes and pull them toward their mouth

Social and Emotional Development

  • Like to play “peek-a-boo,” which involves repeatedly hiding and revealing a face
  • Be happy to play and interact with others
  • Be very affectionate with and excited at seeing their parents

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