You could use a variety of noun phrases to fill in the blanks and make your sentence more descriptive. Here are some suggestions:
- "A happy and curious baby played in the kitchen."
- "A small and chubby baby played in the kitchen."
- "A giggling and messy baby played in the kitchen."
- "A quiet and content baby played in the kitchen."
- "A bright-eyed and smiling baby played in the kitchen."
- "A silly and adorable baby played in the kitchen."
- "A newborn and crawling baby played in the kitchen."
- "A bubbly and explorative baby played in the kitchen."
Feel free to mix and match or choose any combination that fits your desired tone!