Babies feet are different. They don't have bones yet just soft cartilage, and there is no visible arch.

The cartilage is simply surrounded by a fatty pad and it can easily be moulded into the wrong shape if it is constricted. Even tight socks can damage the foot at this age.

You'll notice some very rapid developments at this stage. He will grow strong enough to support his own head, and she will learn to roll over and sit on her own. They are getting ready to start moving around.

You can try some of these activities to help them:

• Change positions often, from cot to floor, from back to tummy, to encourage your child's all round development
• Let baby stand on your lap and bounce to develop leg muscles, it's great fun!
• 'Fly' your baby by holding them in the air to exercise arms and legs, it's even more fun!
• Massaging your baby is relaxing and enjoyable for parent and child, it stimulates growth and improves muscle development
  Give baby some freedom (when it's safe to do so). Let her out of the baby carriers, car seats and pushchairs. Let her move around as best she can
• Play a game of covering baby's arm, leg or foot with a face cloth and let him work it free
  Carry your baby in a sling so she can participate in your activities