Make a toddler dress from a t-shirt.

Step 3 Sew the top of the dress.

Turn the top of the dress inside out. I'm going to refer to the top of the dress as the shirt now.  Line up the seams. Sew from the bottom up to the arm pit, then turn and go down the sleeve. Do the same on the other side. Leave the bottom of the shirt open.

Use about a half inch seam allowance. Make sure you back stich at the beginning and end of each seam.