The answer is either he is using his large muscles or his body heats up but I am not sure which one sorry hope I helped a little
they are activities that arouse or stimulate your baby's sense of sight, sound, touch, taste, and smell. Infant stimulation can help improve your baby's attention span, memory, curiosity, and nervous system development.
Ask your doctor for advice of course it is reasonable because doctors know how to treat most illnesses
