When making nursery rhyme costumes for very young children, the best thing you can do is to keep it simple. It's very important that your child is comfortable, no matter what costume you choose. Nursery rhyme characters and the costumes replicating them are all about the props. Most props can be easily created from materials that you have around the house already. For the most part, you can dress your child in "normal" clothing, or find funkier stuff at thrift stores for very little money.
Dress your tot in blue jeans and shirt, or a blue sweatsuit. Add a straw hat and give him a toy bugle or horn to carry, and he's Little Boy Blue. You can draw, colour and cut out a horn from scrap cardboard.
Put everyday play clothes on your little guy. Affix a big bandage to his forehead for the "broken crown," give him a small pail to carry, and he becomes Jack from "Jack and Jill."
Attire your little boy in whatever is comfortable. Roll a wad of purple modelling clay into a ball about the size of a ping-pong ball. Poke a hole in it with the end of a pencil or pen, and stick it on his thumb. He is now Little Jack Horner.
Cut a picture of a head and torso of a woman from a magazine. Glue the picture to a basketball, and use heavy black marker to draw a "window" around her. Hand the pumpkin to Peter Pumpkin Eater, who can wear his regular play clothes.
Put an oversized T-shirt, night shirt or jammies on your little tyke. Give Wee Willie Winkie a small candlestick to carry, or draw one on a scrap of cardboard, colour it and cut it out.
Cut the flaps off of a large cardboard box. Cut a hole in the bottom big enough to fit over your child's head, and cut armholes in two of the sides. Paint or colour the box to resemble a brick wall. Dress Humpty Dumpty in play clothes, put a necktie on him, and use white face paint to make him up.
Dress your little girl in regular play clothes. Stick a big bandage on her forehead for the "broken crown," hand her a small pail, and she becomes Jill from "Jack and Jill."
Put a pretty, frilly dress on your tot. Add a pinafore and bonnet, if you have them. Pin a furry stuffed spider to Little Miss Muffet's dress, and give her a plastic bowl in which to carry her pretend curds and whey.
Dress Little Bo Peep in her prettiest dress, and a bonnet if you wish. Draw, colour and cut from cardboard a small shepherding hook. Tie a ribbon or yarn bow around it. Give her the hook and a stuffed lamb or sheep to carry.
Glue two white pom-poms to a headband for ears. Put a white sweatsuit and sneakers on Mary's Little Lamb.
Cut some 2-inch circles out of black felt or fabric scraps. Glue or pin them to the back of a red sweatshirt. Attach two black pipe cleaners to a headband for antennae. Complete Ladybug, Ladybug's costume with black tights or sweatpants.