anyone's 3 month old wanting to sit up?

From birth my LO had awesome head control, and now has a pretty strong neck, the past week he keeps doing these "crunches" like he wants to sit up. I'll help him up and he just sits there BEAMING like he climbed Mount Everest! Haha. He also loves to try to stand. Anyone else's baby's doing this? I'll sit him up and take his onesie on the top and hold him balanced by that so he can get use of his muscles a little more but he's still stable and won't fall. He loves it, I feel like he's trying to be so much older than he is 😭