If his having some form of night bottle still try to keep him awake for a little bit after and have him sit up right this will help with any trapped wind/air if his going straight to sleep a thin pillow to prop them up about at 30degree angle should help reduce it a little remover the pillow after about 15/20mins helps the milk to settle in their tummy but still go to doctor You have to check the age on it but you can use gripe water but it can only be used from certain age I think like 6 months but double check to be sure
I doubt any colic relief will help a toddler because they generally don’t get colicky. If you believe gas is the issue this maybe helpful https://www.babycenter.com/health/conditions/gas-pain-in-children_1201487 Sometimes toddlers are just very uncomfortable and it’s hard to say why, if it happens a lot I would definitely check in with a doctor. Hope it gets better
We had awful colic when he was tiny and tried all the remedies. We found that dentinox and baby massage helped the most. If you Google baby massage for gas then it'll show you what to do. We found cycling legs and I love you on his belly worked the best