everybody got their own different stages of physical development
those who talk first also doesn't means they are more intelligent in the future....
most important we ourselves do not feel anxiety....
our worries may in fact hinder their good development....
heard a lot on using of the RIGHT BRAIN...it is thought that the mother's mental stage is "link" to the baby.....try this simple task.....whenever ur baby is naughty or crying non-stop, hug him close, use your right brain to convey the message, any message you wish to send over to produce the calming effect.....
it is said that the baby can catch the mother mental message......of cos this is not just effective after one try...but mother has to keep establish a close and loving relationship with the baby all the while, such that this close mental rapport can be built....