It's nearly impossible to keep things tidy when you have a kid in your home. They like to litter all over the place, and it's impossible for them to clean up on their own, so you need to organize their closets so they can be found quickly when needed.
When dealing with your baby's closet, you need to empty the closet, starting with a blank, this will give you an idea of what's in the closet, what you need, and what you don't need, which is also good for subsequent decluttering.
Next, organize your baby's wardrobe into smaller piles by season, using a laundry basket or trash can for what you need and what you plan to throw away.
Put similar things together
When putting these back in the closet, keep similar clothes together, like t-shirts with t-shirts and jumpsuits with jumpsuits. This will keep your baby's wardrobe looking organized.
Use the storage box
The best way to keep your closet organized is to use storage bins. Use clear storage bins to hold your sorted clothes so you can see what's inside without opening the bin. You can also put labels on the storage box so there is no confusion, very effective method.