Hello I have a 4 month old baby boy. He’s extremely tight, just won’t relax. Even doing a sacral release or pushing his knees into his chest he has resistance. Poos every 2-3 days. Formula fed only. His suck feels lazy to me. Has a thin wirey look, but good colour, alert and happy. How can I get more ease into his system? Have encouraged tummy time and stretching/extension over yoga ball. Thankyou!