Weaning and weight gain

When you stopped breastfeeding, did your baby thin out or stop gaining weight or slow down in weight gain?? Baby # 2 was weaned about 3/4 weeks ago and she’s sooo thin now. We had an appt last week and they weren’t worried bc she was still a pound heavier than last appt but she even looks and feels WAY thinner and lighter. She also started daycare this week and bc it’s a huge change I know she is eating less (its been 4 days). She’ll be 1 on Tuesday. Also, I feel like she (noticeably) suddenly has less hair than before even before starting daycare. Idk mamas I’m freaking out. She has an appt coming up in a few days and i’m scared they won’t take it seriously 😞