my 12 week old only has naps on me during the day, il normally have to rock her to sleep then she sleeps on my chest for an hour or 2, if i try an put her down she will wake straight away or after 5-10mins. and she has never got herself to sleep except in pram or car, and whenever the car engine stops or pram stops moving she wakes again. is this normal or can i train her to get to sleep by herself and stay asleep.