Hello and welcome - congrats on discovering the joys of cloth. I used sposies for my 2 older boys aswell, didnt know any better back then
but have used cloth on my 20 month old since she was born and havent looked back.
TBH if your wee man is only doing a #2 once a week, and he is bf, I cant imagine anything could contain it - but, a wrap with gussets could help. Ive found Tots Bots and Nature Babies have been the most reliable for us, but many people swear by the Motherease Rikki wraps.
Look forward to chatting - but beware, you will buy more nappies - you seem to be on the slippery slope with the stash you have already