question

[cutemina1211]

(a) Even when you are weaning your baby, milk continues to be essential nutrient and important source of energy. (b) Once a full and varied diet has begun to be established, you can give your baby breast milk or infant formula. (c) The minimum intake of any of these should be at least 500 ml of 1 pint per day. (d) Of course, breast milk is undoubtedly the source of nutrition for normal healthy babies.

My text book indicates that the sentence (a) is incoreect.
I don't know which part is wrong in A.
Please explain to me. THank you.

[MikeNewYork]

Originally Posted by cutemina1211

(a) Even when you are weaning your baby, milk continues to be essential nutrient and important source of energy. (b) Once a full and varied diet has begun to be established, you can give your baby breast milk or infant formula. (c) The minimum intake of any of these should be at least 500 ml of 1 pint per day. (d) Of course, breast milk is undoubtedly the source of nutrition for normal healthy babies.

My text book indicates that the sentence (a) is incoreect.
I don't know which part is wrong in A.
Please explain to me. THank you.

Look to see if there is a noun or nouns that need an article.

There is also an error in C, but that may be a typo. Do you see it?