I used to run a weight loss clinic in my earlier role as a prescribing pharmacist. Losing weight is hard let alone when you are breastfeeding and sleep deprived.

See https://breastfeeding-and-medication.co.uk/fact-sheet/semaglutide-and-breastfeeding

I’m sharing the brilliant information developed by Dr Hale and Dr Krutsch which I couldnt possibly improve on. It includes a weight loss calorie calculator if that interests you

https://www.infantrisk.com/content/weight-loss-lactation

https://www.infantrisk.com/weight-loss-while-breastfeeding-calculator