Had a problem with a grobag, she got her head stuck in the arm hole. She is a little houdini, she gets out of anything, car seat, pushchair. I sound so defeatist don't I , sorry. I have checked her car seat straps and the highchair, and they are really tight, but she still gets out somehow. and I am afraid of the gro bag as she struggles so much, she is one determined little girl. must go crying