hello! my baby rareeeeely did tummy time last time as we moved to our own home and i didn't have time to attend or put her in her tummy time position. at 3 months, she naturally started to roll over and from then on wanted to do her own tummy time no matter how much i flipped her back. eventually she was able to lift her head. p/s before that happened, i placed my nursing pillow under her for her own tummy time (which happens....rarely cuz of the unpacking etc.) and also tummy time on my chest.
congrats! that's a good sign! yeah I think can let him stay there and train his neck strength a bit more. tummy time can lengthen over time so gradually your baby can lift his head up a few more seconds, a few more minutes.... :)
Well thats a good sign. Monitor and then flip baby back after awhile. Baby trying to strengthen the neck muscle. So no worries. My #2 did her own flipping 3/4 months.
We let our baby girl be, under supervision. Our rule of thumb is if that action is done by the baby so naturally it should be safe.