Whether you give your baby breast or formula milk, in your child's first year the only other liquid your child needs is cool, boiled water. Indeed, even on hot days, breast milk will quench a thirst as well as water.
So when should you move on to cow's milk?

Breast and formula milk
If you can't feed your baby with breastmilk (for physical or circumstantial reasons) within the first year, you need to move to formula milk. It is important to make sure you are using a formula suitable for your baby's age to ensure she is getting the right nutrients. An iron-fortified milk is important, and there are many on the market including nanny goat formula milk.
Check that the milk is the right one for your baby's age by reading the packaging carefully.
Once your baby is a year old you do not need to give her formula milk anymore, but if you are still breastfeeding, you can continue if you want to as long as your baby's nutritional needs are being met with other food and drink as well.

Why wait for a year to give cow's milk?
At one year you can give your baby cow's milk.
Make sure you give your child whole milk (full fat) as the nutrients are important for your baby and these are lacking in reduced fat or no fat milks.
For young babies, cow's milk does not contain enough iron or vitamin E whilst it does contain too much protein, sodium and potassium. It is also lacking in linoleic acid. Iron deficiency is common and of great concern in young children and babies, and in under-ones, cow's milk can affect the body's ability to take iron from other food sources.

Moving from full-fat milk
After the age of two, toddlers can have semi-skimmed milk but you may still find, if the rest of the child's diet is otherwise healthy and well-balanced, that you want to continue with full fat milk.

Milk and weaning
Although you will begin to wean your baby at six months, breast or follow-on formula milk is still the best drink to give, with a little cool boiled water at mealtimes if it helps your child to eat.
If you want to use milk in recipes for your baby, you can use expressed breast milk or formula milk (make sure the formula milk is prepared as usual and not just used as a powder in meals you prepare).

If you are concern about a cow's milk allergy affecting your baby or child, speak to your doctor or health visitor.