Can I mix medicine in breastmilk before giving to my child? My two year old does not like to have medicines.

Since your child is already 2 years old, I would suggest you mix it in anything she eats. You could put it in her glass of milk, cup of yogurt, or just put it in a glass of smoothie or milk shake. as she grows, slowly tell her why the medicine is important and try to make her have it as it is, without the need to mask.