Any kind of 100% fruit juice may help. Just enough to get him to poop. Esp prune or pear juice. Apple could work too. Run his tummy and try the bicycle method too

Gripe water worked for my son! I also used prune juice and that helped too...he just didn’t like the taste

Seeing that she still young when the store open try getting grip water it helps.

Dried cherries, raisins, olive oil< tbsp *caution, taste is not as appealing