Do I take my 3 Year Old to the children’s hospital?

My son is 3. About 2-3 days ago, he started acting really lethargic, started to lay around a lot, didn’t want to eat or drink. The next day, he was asking for stuff in the morning, but then threw up throughout the day. It’s been a little over 24 hours since he started throwing up and the last time was this morning. Today, I notice his lethargic state is becoming worse. He seems like he’s just been laying around and/or sleeping constantly, asks for food/drink but then won’t touch it, isn’t interested in any of his toys, seems really slow when he does move around, kind of just blankly stares around when he is awake. My mom said she thinks it could be dehydration. Tomorrow is Sunday and his pediatrician is closed. My mom said I could wait another day but I don’t really want another day of just watching him miserable 💔 but I don’t want to be one of those moms who takes their kid in for no reason

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