Haha no worries x
Don't feel guilty (although from now on I would pump and dump x)
I definitely wouldn't give a bottle. Give more regular breastmilk.
I found this as a guide (not sure how recently it was updated). I would keep an eye on his temp too though x
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BREAST-FED INFANTS
No matter how they look, the bowel movements of a breast-fed infant must be considered normal unless they contain mucus or blood or develop a bad odor. In fact, breast-fed babies may normally pass some green BMs or BMs with a water ring.
The frequency of bowel movements is also not much help in deciding whether your breast-fed baby has diarrhea. During the first 2 or 3 months of life, the breast-fed baby may normally have one BM after each feeding. However, if your baby's BMs abruptly increase in number, your baby probably has diarrhea. Other clues are poor eating, acting sick, and a fever.
Remember that something in the mother's diet may cause a breast-fed baby to have more frequent or looser bowel movements--for example, coffee, cola, or herbal teas.
Diet
If your breast-fed baby has diarrhea, treatment is straightforward. Continue breast-feeding but at more frequent intervals. Don't stop breast-feeding your baby because your baby has diarrhea. For severe (watery and frequent) diarrhea, offer Kao Lectrolyte or Pedialyte (in a sippy cup rather than a bottle) between breast-feedings for 6 to 24 hours only if your baby is urinating less frequently than normal.
You may have to stop breast-feeding temporarily if your baby is too exhausted to nurse and needs intravenous (IV) fluids for severe diarrhea and dehydration. Pump your breasts to maintain milk flow until you can breast-feed again (usually within 12 hours).
Hope this helps some and if you're worried call your Dr xx good luck and hope he gets better soon xx