Possible Clues:

• Boo-boo, in totspeak
• Skinned knee, to a tot
• Infant's minor injury
• Boo-boo, in tot talk
• Abrasion, to a tot
• Boo-boo, to tots
• Little injury, in baby talk
• Injury, to a 45-Across
• Minor injury, cutely
• Cutesy word for a scrape