Baby Knitted Vest (flat): From back to front, practically 1 piece. Fronts can be knitted simultaneously if you attach a 2nd yarn ball at the shoulder on the return WS row after binding off the back of the neck. This kind of vest does seem to be popular in Turkish blogs and on the English-speaking web I have seen it called "Turkish Tabard" (a tabard was a sleeveless coat without sides). Here you do seam (or loosely lace) the sides from underarm to waist, but it's kind of an "afterthought" seam.
SATILIK - Bebek / Toddler DK Hırka ve Ceket 3 stilleri 16-24 ins - Vintage Örgü Desenleri Bebek 1056- pdf
SATILIK - Bebek Qk Matine Coat 2 stilleri 3 15 ay -Greenock 777 - Vintage Bebek Örgü Desenleri PDF