• How long do most people live?
  Most people in the developed world live until they are over 70 and ...

• How does an unborn baby feed?
  Most of the cluster of cells that embeds itself in the womb grows ...

• Why do babies cry?
  A baby cries when it needs something-when it is hungry or lonely. It ...

• Are newborn babies completely helpless?
  A baby can breathe, suck, and swallow from the moment it is born, so ...

• When are you fully grown?
  Boys and girls grow quickly during puberty, and then they grow more ...

• What happens when a boy’s voice breaks?
  A boy may be growing so fast during puberty that the muscles that ...

• When do babies learn to walk and talk?
  By its first birthday, a baby is usually already pulling itself up on ...

• Why do you have to support a young baby’s head?
  When a baby is born the muscles in its back and neck are very weak, ...

• Why can’t young babies sit up?
  Young babies cannot sit up until their back muscles have grown strong ...

• Why do children look like their parents?
  You inherit a mixture of genes from your parents, so in some ways you ...