Girls, how do you handle "advice" from grandmothers, mothers-in-law, r…

Girls, how do you handle "advice" from grandmothers, mothers-in-law, relatives about things like giving a pacifier, giving water in a bottle, putting coins in the diaper, etc. I won't be doing any of that, but they insist on it every day, even without listening to me. Even if the baby cries a little, they immediately start blaming me. For example, his tummy hurts, but you don't give him water. Honestly, I don't want to ruin their relationship with me, everything was fine before the baby was born, now...???