I have 10 months old baby she is taking lactose free cow milk since 7 months do i have to give her extra vitamins or suplements ?

Cow milk: Cow milk has been shown to interfere with iron absorption in the infant's intestines and is, therefore, not recommended until the baby turns 1. It can cause sometimes bloody diarrhea. I would suggest that you better get a formula for your baby or breastfeed if still an option.

Yes: The lactose is just a sugar and requires no vitamin replacement. Otherwise the milk it is as healthy as milk can be, but it is designed for cows. Infants will need a broad diversity of solids and vitamins if you have been on cow milk since 7 mo. Limit cow milk to less than 24 oz/d to avoid iron loss and add a liquid multivitamin to make up for the deficiency.