4month old just started rapid side to side body movement.

I googled why, don’t - the first page of results was all about cerebral palsy, someone ease my anxiety...He’s just started shaking his body side to side, kinda like when they are looking for a nipple, but much stronger and not when he’s hungry.Is it a development thing? via /r/Parenting https://ift.tt/2x6EOD4