Hands to feet play is an important developmental milestone that we should encourage. Babies learn to move by layering each new skill on top of each other. They also use skills learnt in one position to help develop their abilities in another position. Hands to feet play will develop skills that will be useful when they learn to crawl, sit and in early walking. Most babies will learn to reach their knees by four months and by six months be busy exploring of their toes and feet.  This might even include putting their toes in their mouth!