Pirate & Mermaid - Under the Sea / Birthday "Ethan & Sophia's Pirate & Mermaid…
Boy-Girl Twins Birthday Party Ideas by Double the Fun Parties- **Pirate vs Mermaids
Lots of fantastic Dr. Seuss ideas at
The Very Hungry Caterpillar / Birthday "Matthew's Birthday"
Joint Garden Party - Frog & Butterfly Themed Birthday: Party Ideas, Printables and Styling
Animal Circus Themed First Birthday Party - Inspired by This (Party Top Carnival Themes)