Whats the normal development of a 3-year-old?

Three yrs: rule of 3: Three is a fun age! most 3 year olds can do a lot of "three" things: 3 word sentences, 3-4 phrase conversations, follow (when they feel like it!) 2-3 step instructions, and can ride a 3-wheeler (trike). Three year olds have short (think 3 minute!) attention spans. For some really nice information about child development, check the cdc site (cdc.Gov) or the aap parent site, healthychildren.Org.