Reddit reviews New Day Baby Boys' Cotton Brief Pack of 10 12-18 Months Multi-Coloured
We found 2 Reddit comments about New Day Baby Boys' Cotton Brief Pack of 10 12-18 Months Multi-Coloured. Here are the top ones, ranked by their Reddit score.
Cotton fabricPack of 10 piecesMulticoloured
I don't know if these are in your price range, but they come in 6-12 and 12-18 month sizes!
https://www.amazon.com/New-Day-Baby-Cotton-Brief/dp/B00WT8P8L2/ref=sr_1_1?ie=UTF8&qid=1501523771&sr=8-1&keywords=toddler%2Bunderwear%2Bcotton%2B12&th=1
H&M had a brand that had 18m sizes. Also, if you have a china town or Asian shopping mall near you the import clothing brands are usually sized much smaller than clothes intended for "western" markets.
If you want to order online Gerber has underwear on Amazon in tiny sizes
https://www.amazon.com/gp/aw/d/B00WT8P8L2/ref=mp_s_a_1_3?ie=UTF8&qid=1468789659&sr=8-3&pi=SY200_QL40&keywords=18+month+underwear&dpPl=1&dpID=41aHwR6XR8L&ref=plSrch