Good for You! This is an excellent way to provide clothes for babies and children. I know of one, The Good Shepard House. I think it's on Halsey perhsps in psste 150th. It's probably listed in the phone book.
There are some more shelters but there addresses are kept secret. when I was working not even police officers knew their locations. You can find those thru phone #'s. I'd call the Salvation Army. These shelters do have a public phone line. You could call the police desk and they could probably give you their numbers. What they do is arrange for a meeting with you away from their house.
Another group who needs clothes are the Head Start parents. My grandsom was in headstart for awhile and the school had a table in the hallway for donations of clothes and toys.
You could also call Children's Services. I think it's listed in the blue pages under State of Oregon.
Some large churches also help needy people. You could also call one of them.
By the way, you can still get tax credit. Write down what you give and estimate it's value. Turbo Tax, I think is the one, has a program to help you value your donations. It's free when you use their tax program.