If you can try cooled down boiled water
I can't tell from this, but he needs to be sipping lots of water with each solid meal. Without water, he'll get constipated. As much water as you can get him to have providing its sipped (sippy cup, open cup, etc) as per nhs. If he's having lots of water, then warm baths, lots of tummy time (especially after meals), massage, bicycle legs and if in pain speak to your doctor.
@Lucy yes I have been giving his open cup at meals and his beaker though out the day but not drinking lots. Even tried blended prunes and water into a ice lolly to get fluid and prune into him
It’ll be dehydration - with food they need water . Just try all different cups x
Don't think dehydrated as he has lots of wet nappies
Pears, prunes and figs in whatever form he’ll have them. My little one loves prune juice and pear pouches are sweet so they can’t say no to that 😂