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Vaginal lenght varies and will shorten when aroused during intercourse. Inbeween the baby and the penis is the cervix which is about 3 inches long and very firm. It is virtually impossible for him to hurt the baby during intercourse. The baby may move around during intercourse depeding on how much you move but the reality is that it is floating in a little water balloon totally oblivious to what is going on. Sex is perfectly natural and safe during pregnancy. This question along with other sexual myths in pregnancy and which sexual positions are better or making boys believe it or not is in the book listed below

ok in case you propose how thick the floor is from the toddler to her outer abdomen , then that actual relies upon on how a ways pregnant she is the greater pregnant she is then the thinner the floor turns into and thats once you will see babys ft and palms poking out!

Im not sure about it but im sure that much movment and stuff cant be good for it i wouldnt if i were you