having problems

My mom in law is forcing the issue for me to put my baby on formula I'm doing exclusive breastfeeding but they scared for the fact that If I leave my baby with them then she cries until I'm there so i have to go everywhere with her I'm very scared to actually walk with her in a carrier coz I have very weak legs so i fall sometimes I'm scared il fall with her nd she is onmy 2 months old the reason i dont want to put my baby on formula is that my eldest had stomach problems when I had my second child she just drank breast milk nd didnt have any problems now they want me to make that mistake of listening to them nd taking their advice where as the clinic told me to just give breast milk until she is 1 year old or until she leaves the breast herself. So coz of that I'm very scared to leave my baby with them coz I dont know what they cud give her. Nd maybe her tummy wont be able to handle it