my daughter is 3 1/2 months old now (2 months adjusted age) and she is still sleeping all the time. she wakes up for a couple of feedings (and i just give her the bottle for the rest) and then usually she will be awake for about 3 hrs. however somedays, she just sleeps the whole day. she seems so exhausted. is this normal for her age. we try and wake her up, but she just wants to sleep. thanks for your help.