DD is 6 months old & will only nap on me, in pushchair when out & about or in car seat. I know I need to start putting her down on her cost but she just wakes as soon as I put her down & screams blue murder. I know she can go to sleep on her own as she does at night. I've been looking at books on sleep/napping but I have no idea which are any use. If anyone can recommend any I'd be grateful.