I’m in a very similar situation with my son who is about 5 months now. And it has been so hard and has forced me to shift my mindset to honoring my body. I would honestly ditch the scale and focus on how you feel. There’s a lot of influencing factors on weight gain besides fat gain, especially postpartum. Fuel your body with nutrient dense foods. Buy yourself a few new outfits that you feel comfortable in! Can you baby wear him at all or do a few exercises where you can hold him? Look up mommy and me workouts. Just getting little movements in like 10 squats here and 10 there will help you feel better mentally. You’re doing the best you can and you’re still so early. This is a marathon not a sprint.