Could they be donated to animal shelters that often deal with baby animals that have lost parents and need to be hand reared?

Also works great to hold any liquid you would need small amounts of, when I was little we put grape juice in them to fill the communion cups because they were such small glasses.

Keep oil in them to lube squeaky doors etc.

They would make some cute decorations, fill with something pretty.

Use to transport fish.

I have a friend who has a bunch, and she fills them with change, then when they’re full she puts them in her kid’s college fund.

Seal it closed put colored rice (you add rubbing alcohol and food coloring, mix with dry rice or pasta, let dry) give them to kids to play with.

Fill with food coloring and water, let kids “paint”

There are no shortage of charities that need baby bottles and other baby items for underprivileged babies and for third-world countries. Your local hospital or charity, or international organizations like this one: http://www.feedthechildren.org.uk/pages/resources_giftsinkind.shtml

There’s no shortage of people who need baby equipment like this if it’s in good shape. If not, then give them to your little girls for their dolls.

We keep a couple of old baby bottles to use as measuring cups for liquids. If you need to add a quarter cup of milk or water to a recipe, it’s the same as two ounces on a baby bottle.

If they can be sufficiently sterilised for your baby, they can be sufficiently sterilised for someone else’s - these things are manufactured to be sterilised between uses. Hand them onto a family member or friend who needs them, pass them on to a charity or a local hospital with a baby unit, take them to a car boot sale/jumble sale, or ebay them.