Ano pong magndang iswitch n milk ni Baby dati po kc Promil pero nagtatae siya ganun dinn sa Bona?TIA

1st ko talag triny mommy dun sa baby ko Similac nung 6 months sha kasi kailangan nako bumalik sa work. Hanggang nag 12 months sha. Super okay kay baby kasi di sha nagugutom agad, di rin sakitin. Then I switched him to Pediasure until he turned 24 months. Now he's 29 months, I switched him to Nido na and so far so good naman dun sa mga milk na inintroduce ko sa kanya. I also tried Bonamil pala nung 8 months nya ayaw nya. then nung 1yr nya I also tried Lactum peor grabi tigas ng poop nya and hindi sha nabubusog. Kaya ayun. I asked his pedia if okay lang magmix yung milk sa kalipat lipat, okay nmn wag lang e intoeudce at the same timw which is which. Atleast give your child 1-2 weeks to see if hiyang ba sa milk or no. then you can make lipat.