Our boy is 8 weeks now but in the first few weeks I called the triage midwife line as he hadn’t pooed in 48 hours - they told me as long as it’s not over a week, it’s okay! Sometimes it just happens apparently. Not sure on any tips to help though, maybe ask the doc!
Warm flannel on the belly, a warm bath and bicycle kicks may help it really helped my daughter go x
My baby has gone days without pooping since he passed all the miconium so i feel your pain, it's horrible seeing them so uncomfortable and not being able to help. Most people we've spoken to about it have said 3 days without poo is perfectly fine. If your baby continues to struggle, I'd suggest going to your gp and they might prescribe lactulose which works a treat. They're digestive systems are still developing so it's normal for their stools to change in frequency at this age