Having a non-hungry day? (Almost 12 wks)

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Hi

My lo seems to have hardly fed at all today. She's mixed fed but mostly BF with 1-2 formula top ups when required (long story, but I'm trying to get to EBF eventually!)
Anyway today she just won't settle at the breast. Usually she enjoys a good suck for comfort/sleep when I indulge her but she doesn't even want to do that today. She's just upset and whimpering at the boob.
Also she hasn't really had a big sleep today - I can see in her eyes that she is tired! Are there just days like this or could there be a reason?!

Thank you x

Normal in my opinion, I know my boy went off milk sometimes for a couple of days at a time. I think it was growth spurt related, it normally happened just after a few days of mad feeding.