My DH and I are spending a weekend away from our 6 month old who is exclusively breastfed. My mother in law seems to think all babies need formula and everytime we see her she feels the need to bottle feed our son despite my telling her he needs to nurse etc. Any suggestions on how to handle her while we are home? Our son has a severe milk protein allergy so if he ever takes formula is has to be soy. I'm afraid if I don't bring any, she will just go buy some and it will be the wrong kind. Thanks so much!