'advice' question?

2 of Dans friends seem 2 think they can tell me wot 2 do. for example, i found infacol works best wiv Lilly, but when i was abt 2 feed her and gave her the infacol, i was told not to use that 'cr@p' its useless, doesn't work @ all, the bottle was taken off me, 1 nipped off 2 the kitchen n came back wiv the bottle, i umd she'd just noticed it was leaking (its a mam bottle, leaks water form sumwhere) n cleaned it up n gave it 2 lilly, half hour later she was screaming the house dwn! 1 said 'bet shes worse than this normally isn't she?' when i said no they said 'no, im sure she must be, that infacol doesnt work, i put gripe water in the milk4 u, ur welcome!' gripe water upsets lilly's tum so i dnt giv it her. this is just the lastest example. how can i stop them TELLING me wot 2 do? Dans insisting they're god mothers so i cnt just not see or tlk 2 them