My dd2 has always been a really quiet baby. She cries when hungry or tired, she does a feeble moan if she's wanting attention and she laughs at her big sister. She has just started to do what I can only describe as 'growling' (!) - and other than that she makes no sounds! No consonants at all, no sing song babble to herself. Almost everyone who meets her comments on how quiet she is. She passed her newborn hearing test and I'm sure she hears fine now. Do you think I should be concerned or is she just a quiet girl? Thank you