Hi mama! It can happen with mixed fed babies talaga, especially pag mostly breastfed kasi ang breast milk is easier to digest, pero 3 days without poop ay pwedeng mag-concern na, better to check with your pediatrician to make sure baby's okay, baka may mild constipation or need lang ng adjustment sa feeds. A few of us tried increasing water intake (para sa baby through more feeds) or gentle tummy massage pero honestly, since your baby is still so tiny at 2+ months, mas safe talaga makipag-consult sa doctor para sure na walang problema at matugunan agad. Keep an eye din if baby seems uncomfortable or gassy, mama!