Hi mummy,
I believe breast milk is the one with natural probiotics, not sure if formula milk has it.
Even on breast feeding, my paediatrician still advised me to give biogaia probiotics (+vitamin D) daily, can be given with formula milk.
During post delivery, KKH advised to give baby Vitamin D supplements to help strengthen their bones.
Therefore, I believe is safe to give your LO probiotics, it is just supplements to them. No harm.
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