This means they might cruise around furniture or enjoy walking and standing while ... nervous system is working properly." At 9 months old, your baby will have, on average, added about 1/2 inch ...

Finally, the coup de grace: walking unassisted. This can happen as early as 9 months and as late as 18 ... but so too is there a tinge of sadness: Your baby is moving on, farther and farther ...