I can't see too well but if baby is bringing legs and bottom up they're probably pushing for a poo or fart xx
Mine is the same - I would probably say worse and he goes red/purple etc. it’s constant. Google grunting baby syndrome. Apparently it’s them learning which muscles to use to open bowels etc.
Totally normal. Whoever coined the phrase ‘sleeping like a baby’ had clearly never actually watched a baby sleep 😂
Following as mine does the same