Possible Clues:

• Baby bump?
• Bumped knee, to a tot
• Scrape, to a tot
• Boo-boo, to a tot
• Scrape in the sandbox
• Honey of a boo-boo
• Cut or scrape, in totspeak
• It's under a toddler's Band-Aid
• Scrape, in kidspeak
• Scraped knee, to a toddler