Does your 2 year old normally have constipation with the current formula? If no, then changing formula wouldn’t be the first solution. Since 2 year olds are already having regular foods, should try to increase their fibre and water intake. Can try to give yogurt daily (eg 2-3 tablespoon of plain yogurt)
Hi you can try Enfamil Gentlease it’s good for gentle tummies and eases the digestion
can add probiotics powder into your FM. https://s.shopee.sg/30XmbaVEht
You can consider adding probiotics to the formula milk instead.
Give fruits, yogurt.