MIL Gave my baby water

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We went to visit my MIL and my fiancee family this weekend for fathers day. Me and him went to catch up with one of his old friends while his mom and aunt's keep my LO. My LO always have hiccups and I guess he was spitting up while we gone. Well when we came back they had have him an once and a half of water. I was upset. Telling me so he won't have thrash in his throat and our parents have us water and everybody came out just fine he is 2 months