This pullover is worked in the round from the top down, with yoke and sleeve increases done first, then body, and sleeves worked last. Because I have grandchildren who are growing fast (too fast!), I made this flexible, sizing by gauge/yarn weight:

24 sts/4”--finished size 20” (9 mos)
22 sts/4”-- finished size 21” (12 mos)
20 sts/4”-- finished size 22” (18 mos)
18 sts/4”-- finished size 24 1/2” (2T)
16 sts/4”-- finished size 28” (4T)

Model is 18 mos, worked with worsted weight yarn and size 7 US/4.5mm needles.