Has anyone had a baby who won't/can't sleep flat? This happened for first two months with first child and is now apparently happening with no 2, a week and a half old....WHY????? Both regurgitate when flat, no matter how long they've been held for. Have to say, oldest was cured when her aunt babysat and, not knowing about her sleeping in the car seat, popped her into her cot...and after that she slept beautifully....is it psychological on my part?!