Here is a free machine knitting pattern by Anino Ogunjobi to fit a newborn or 0-3 months old baby.
0-3 months old sweater/jumper with buttonhole shoulder opening machine knitting pattern using sk280 knitting machine can be adapted for any flat bed knitting machine.
If you do use the Lk150 knitting machine, we have the pattern in a previous post for you here.
You can visit ANINO TV on youtube to watch the Anino Ogunjobi demonstrating how to knit this sweater on the LK150 knitting machine.
She went further to demonstrate the buttonhole too. It is a class in itself.