Once again, an old fashioned knit from a Patons Book number 392: "Those Beautiful Days in Feathersoft". This book features some 3 ply projects originally envisaged using the Patons Feathersoft Bri Nylon yarn. Now long out of production.
These patterns work beautifully in any 3 ply yarn and I am sure would also work well in 4 ply. They include cardigans, a jumper and and dresses, jackets, singlets, hats, bootees etc in the layette style that babies in earlier years were attired.
No. 5 pattern Cardigan has a textured garter wave design that creates a light, but warm stretchy rib that works from the newborn stage right through the first few months. In the photo below it is the mint green cardigan bottom left. I used a lemon yellow Patons pure wool 3 ply from my stash. Sorry I don't have a photo, it disappeared from my phone.
Grandmother and knitter from the land down under of fine merino wool.