Which is better for LO who is turning one and has been fully on breastmilk? Formula milk, goat milk or fresh milk?

For my firstborn, I give goat fresh milk, cow fresh milk in the beginning and finally fm, because pd said she is very small in size. However, fm does not help in weight gain at all but causing her to have many coughs with wet phlegm. We change a pd and also seeing a tcm doctor for her cough whom both recommended me to bf her back to beyond 5; which we did and mix feed with oat/fresh cow milk. For second born, we give purely fresh milk only in school and bf whenever she is with me. She is still small size but better appetite with solid food. Surprisingly, we did not have any issue with cough for her at all.