Ok, here’s a rough pattern. It really is very easy and the size is adaptable. I can’t give you a gauge, since I gave the sweater away. I used Brown Sheep Superwash on size 8 needles. It makes a sweater that is a 9-12 month size. This is a bottom up raglan, you will be adding the sleeves at the underarms. I used this tutorial to understand how to attach the sleeves.
Garter Rib in the Round:
Row 1: K all sts
Row 2: K2, [p1, k2] to end P1 (purl last stitch)
Repeat these 2 rows for Garter Rib.
Sleeves (make 2)
Using circular needle or DPNs, CO 39 stitches.
Knit 5 rows in stockinette stitch.
Switch to garter rib and knit until 7 inches. This measurement is wrist to underarm, adjust as necessary. Keep in mind that if you want to fold the cuff up, you need extra length.
Put the live stitches on a spare needle or cable.
Body (starting at bottom)
CO 59 stitches and knit in garter rib in the round until piece measures 7 inches. This is the bottom hem to underarm, adjust length as necessary. Ending after row 2.
Now, find the sides of the body of the sweater. Place markers here.
Put 4 stitches from the arms (I used 2 on each side of center marker) on a holder. Now, knit the stitches on the body until 2 stitches for the marker, put the next 4 stitches on a holder. Continue knitting the rest of the stitches from the arm with the body. Do the same for the arm.
Continue knitting in garter rib. On ever other Row 1, knit to 2 stitches before marker, ssk, sm, k2tog.
Continue decreases until you are happy with the size and shape of your sweater. Keep in mind that you leave a big enough neck to fit a baby head through (and some babies have big heads) Knit (in garter rib) a couple of rows without decreasing. Knit 5 rows of stockinette for the rolled collar. Bind off remaining stitches. You still have the 4 stitches from arms and 4 from body on holders at the underarms. Use kitchner stitch to graft them together, or turn the sweater inside out and use a 3 needle bind off.
Fold up sleeves.