I have a 2months old son and suffers from constipation. which formula would be best for hm? unfortunately he doesn't want to be breastfed?

Typically, when an infant has constipation, it is because they need to be fed more frequently or with more volume. A typical 2 month old will take 4-6 ounces every 3-4 hours. Start with an easy to digest formula such as NAN HA. Avoid giving anything other than formula. Especially avoid thickened formula as this can constipate.

I would suggest a non cow milk formula. There are many options - soy, elemental protein formulas. Make sure whichever you choose is iron fortified. Iron in infant formula does not cause constipation, contrary to popular belief.

Another option would be to pump/express milk; most likely to reduce a constipation problem.