Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: What is the lid/top of the bowl diameter?thank you.Elena
Document: My main concern either way is that the lids don't sit tight on bowls! I can turn the lid easily on the bowl when it's on, instead I shouldn't be able to turn/move the lids. Well, you get what you paid for.
Sad - I was excited to find the perfect size baby food container that wasn't plastic . .. with a lid! But then I get them. One of the bowls was chipped and the chip was in another bowl with the lid on it, obviously shipped that way. And the lids literally spin while on the bowl - I put water in one and it poured out from under the lid when I tipped it. Obviously wont work for me.
Love these bowls. Even that they are not the top quality, manufactured in Mexico, they suite my need. I put herbes, butter, egg yolks in them, the kind of things I was not able to use all after a baking session. I also use them as prep bowls.They are a little bit small for leftovers, at least in our family. And don't put onion in them, the plastic lid will smell for a really long period!
The ridges and round shape make them comfortable in my hand so I don't worry about dropping the bowl while feeding a squirmy baby.
I make my own baby food and wanted a glass bowl I can put the food in to thaw and then heat it up and feed it to my little one. This fits food without almost overflowing and is so useful. Love it!
I wanted a  glass pudding cut with a lid. The other ones I had the lid kept popping off. These stay put.
Great for serving and storing baby/toddler portions. The glass sterilizes in the dishwasher and it's just the right size. Snap on lid very handy-doesn't bend out of shape in heat of dishwasher.
I don't like heating food in plastic in the microwave so I use these in my lunch and can heat stuff right in them. Don't put the lids in the microwave though...use a napkin or paper towel because the steam will warp the lid.
I've recently been trying to move away from plastic in my life, so I use these really sturdy (American made!) bowls for all the things you would use a normal custard cup for, but with the added bonus of a snap-on lid so it can be covered in the fridge.
I bought this to feed baby food. Love the fact that it has lids. I can thaw home made frozen food in these overnight, save cooked meals etc.. The lid is quite tight so you can use it to carry snacks etc without worrying about leaking. Thick enough glass to prevent from chipping or breaking easily.
Answer: 3.5" OD and ~3" ID, nice and useful little product.