My 4 year old who up until now has prounced words properly, well since his grommets were put in anyway. About 6 weeks ago he started dropping the T in water, I pretended I couldnt understand him and asked was it waTer he wanted, its gone on and now he is dropping the T in lots of words, ie. dirty, better, butter. I like to think we speak well at home, certainly prouncing T's. He goes to a private nursery and from my contact with the other children all of them speak very nicely. Is this a phase or very common with this age group. I expected problems when he started school but not this early. Any advice appreciated.