Reddit mentions of Gerber Baby 4-Pack Short-Sleeve Onesies Bodysuit, white, 4T

My daughter does the same thing and wears the same size. We buy Gerber 4T onesies and cheap overalls and we just bought a bunch of biketards. All of them can be bought on amazon (links below). This will make changing the diaper more difficult, but at least your kiddo won’t be able to get into the diaper. I also find that the biketard snugness helps my daughter behave better in general.

Onesies: Gerber Baby 4 Pack Onesies, White, 4T https://www.amazon.com/dp/B01BPG22TO/ref=cm_sw_r_cp_api_i_hNm8AbEPVK71G

Overalls: The Children's Place Baby Girls Shortalls, Olliewash 5987, 5T https://www.amazon.com/dp/B0748M258T/ref=cm_sw_r_cp_api_i_NPm8Ab9CESZKC

Biketards: Gymnastics Leotards for Girls Mermaid Print Costume for Halloween Blue ,Shiny Mermaid,110(4-5Y) https://www.amazon.com/dp/B076P52L1Q/ref=cm_sw_r_cp_api_i_qQm8Ab367WK8A

We also bought some therapy compression shorts and pants, but you should always be sure to check with an Occupational Therapist before using true compression or weighted gear for your child. We bought ours through Kozie: https://www.kozieclothes.com/unisex-compression-shorts

Good luck! Know that you aren’t alone!