400 Days Milestone
Over 13 months of incredible toddler development
Is your baby approaching this milestone?
Calculate their exact age to track development stages and get personalized milestone reminders
Is your baby approaching this milestone?
Calculate their exact age to track development stages and get personalized milestone reminders
Day 400 of your baby's journey
Development at 400 Days
Track your baby's physical, cognitive, and social development at this milestone
Physical
- ✓Walking independently with confidence
- ✓May climb stairs with assistance
- ✓Runs with unsteady gait
- ✓Can kick a ball
- ✓Stacks 2-3 blocks
- ✓Uses spoon with some success
- ✓Drinks from regular cup
- ✓Shows hand preference emerging
Cognitive
- ✓Vocabulary of 10-50 words
- ✓Follows two-step instructions
- ✓Points to body parts when named
- ✓Shows understanding of 'no'
- ✓Imitates household activities
- ✓Shows symbolic play beginning
- ✓Recognizes familiar people in photos
- ✓Demonstrates memory for routines
Social
- ✓Shows defiant behavior occasionally
- ✓Demonstrates empathy for others
- ✓Plays alongside other children
- ✓Shows affection openly
- ✓Seeks independence in activities
- ✓Has favorite comfort objects
- ✓Shows strong emotional reactions
- ✓Enjoys interactive games and songs
Development Tip
At 400 days (approximately 13 months), your toddler is fully mobile and increasingly independent. Language development accelerates rapidly. This is the height of exploration and curiosity. Toddler-proofing becomes essential as climbing and reaching abilities expand daily.
Parenting at 400 Days
Expert guidance and activities for nurturing your baby's development
Daily Care
At 400 days, toddlers typically sleep 11-14 hours with 1-2 naps. Three meals plus snacks are standard. Self-feeding skills improve daily. Tantrums may begin as independence battles emerge. Safety becomes paramount with increased mobility and climbing abilities.
Recommended Activities
- 400-day celebration party
- Create walking milestone video
- Start language development tracking
- Document favorite words and sounds
- Plan outdoor exploration adventures
- Organize playdate with peers
- Make recipe of current favorite foods
- Create development comparison photos
- Start bedtime story traditions
Parent Guide
The 400-day milestone marks true toddlerhood. Your child is becoming increasingly independent and opinionated. Balance safety with exploration opportunities. This period requires patience as tantrums may emerge alongside wonderful discoveries. Celebrate their growing personality and capabilities!
Celebrations & Memories
Cultural celebrations and memory-making ideas for this special milestone
Milestone Celebrations
400 days represents the transition from baby to toddler across many cultures, marking the beginning of true independence and personality emergence.
- Toddler blessing ceremonies
- First walking celebrations
- Language milestone recognition
- Independence day family traditions
- Cultural toddlerhood acknowledgments
- Community milestone sharing
Memory Preservation
Photo Ideas
- Independent walking achievements
- 400-day milestone announcement
- Exploration and adventure shots
Memory Tips
- Current vocabulary words
- Favorite activities and games
- Independence milestones
Cultural Note
Many cultures celebrate the transition to toddlerhood around this time. The 400-day mark often coincides with increased social expectations and the beginning of more structured learning opportunities.
Recording Suggestion
Document the toddling stage with videos showing unsteady but determined walking. Record current vocabulary and pronunciation attempts. Capture the curiosity and fearlessness of exploration. Write about the joy and challenges of this independence phase.