Shorts can be made out of just about anything and fabrics for spring and summer are exciting. The light weight printed and plain twills work well. Knits are super. Not only do the knits wash and wear well, they are also comfortable and breathable. Plain interlock is a wonderful weight for shorts and with the variety of colors available, coordinating with shirts is easy.
Some sewers are unsure whether to choose a baby pattern or a toddler pattern.
The correct choice is determined by the mobility of the child. The major pattern companies design the infant patterns for children that wear diapers and crawl. Once you get into the T1 through T4 size range, these patterns have been design for walkers.