Open up wide and get ready to drink from the fire hydrant turned all the way up to 11.
Do NOT start reading pediatrics review books like crazy. Do NOT start memorizing the Lane like a maniac.
Do realize that most people will expect nothing from you except a good work ethic and a humble enthusiasm to learn.
Do make the most of the last few months of 4th year, it can be so much fun. Residency is, too, but with less free time.
Congrats on matching!