tt's what my son did! or rather, he is doint that even until now.. die die wanna slp on tummy.. -.-"TS i think u also bo bian right... coz once u put baby down, baby will cry as compare to tummy style.. But as long u got supervise on ur baby, it should be ok coz i am doing so also.. but not too long, as i scare it may hurt baby organ like heart, lungs, etc...