How can my 4m old baby transition from breast milk to formula? she's tried many and just won't take any and bottles are not the problem.

Weaning from breast : If you are willing to pump your own breast milk & freeze it for daily use sine the baby is refusing to drink any formula, other wise you just have to keep trying until the baby gets used to one of the formulas, very soon you will be introducing sold food & that will help but you still need to offer formula or pumped breast milk. Good luck.