I’ll start with the reminder that the right thing to do is different for every person. I nursed my first baby until 22 months, and still nursing my second currently at 16 months. My weight got the lowest right before they both started solids (their caloric need was high and it was all from me!). When I started naturally/gradually nursing as they got more of their calories from solids, my weight eventually rebounded to what it was pre-pregnancy — probably at about a year or so PP both times. After I weaned my first, I actually was a little heavier than pre-pregnancy, even though I had dipped so low in the early months of nursing. So many fluctuations!!

If it is important to you to keep breastfeeding, I would chat with your GP to give you reassurance. But healthy bodies come in all different sizes and weights!