Constipated 10 months old. HELP!

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He still drinks formula but thinking to change it. Is it too late? Thinking Bobbie. I feed him more vegetables and fruits and less meat but no luck still. He is also teething so bad so don’t know what to do. He drinks 5oz of water daily. His poop is just as tiny as it can be.

I tried 2oz of prune juice and he does not like the taste of it.