My sister is here with her almost one year old that is on her daddies schedule. Up during the night and asleep during the day. She is super fussy all the time. It is waking up my 7 week old. I’m starting to get really frustrated with already my lack of sleep, But my sisters baby waking up my baby. I suggested gripe water. But she said she is out of formula. So I went to the store and got her some. She was out yesterday. And has only given her baby pedialite! She didn’t even tell me! She is calling her baby fat... when she is only 14 lbs. I’m so furious. I knew my niece was under weight. But two weeks from being one and my 7 week old is almost at her weight!!! ( 11.2 lbs)

What would you guys do?