Constipated toddler 1yr and 4months

Mga mommy pls help me ano po marerecomend nyong milk for my baby nakailang palit na kmi ng formula milk pero talagang constipated pa dn kht na nag water naman lagi at papaya.. Etong huli pediasure choco lakas mg milk at solid fud pero kapalit naman severe constipation.. Hipp organic 1-3 po ba ay ok sa constipated baby? Or any milk n marerecomend nyo while waiting pa sa reply ng pedia ni baby. Para my idea lang.. Thankyou#advicepls #pleasehelp #firstbaby #1stimemom