Potty training

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Help! I need to potty train my almost 2.5 year old boy before the next one arrives in June. Any tips? Mamas help!

Disclaimer: We do have a little potty right by ours in the bathroom and he will sit down on it and pee when we tell him to. We also have training underwear. I guess I’m just kinda scared of all the messes. Haha how did you make the switch from diapers to undies? Ahhhh