Baby formula & constipation?

Has he suggested any Soy formulas? My nephew had the same problem and they switched him to Alsoy and he's been doing great. Also, tell your pediatrician to shove it with the "its hypoallergenic" crap... hypoallergenic means your less likely to have a reaction, not that its impossible. Im allergic to ONLY hypoallergenic bandaids (like the ones they use in hospitals... I have to either bring my own for an IV or go without lol)