my baby has just started to打側身in these few days, he is also just 3 months old. in addition, my maid will lie him down and my baby will try his best to抬頭 (手仔支撐住),today his head is higher than yesterday! this exercise is good to train his neck & arms' muscle, but need to be careful once he drops his head, and not to cover his nose...my maid will then put him on bed, his face on top to let him breath.
i think most of 3 months old bb will soon start to learn to turn, don't worry too much!
Jamie started to 打側個身 when feeling sleepy since about 2 month-old. Now she seems to want to flip over but not succeeded yet. May be her bed is a bit too small? Guess, she needs to work harder Or we may need to train her in our bed.