Just on the off-chance someone did not know this, you cannot renew a childs passport. You have to start from scratch and get the birth certificates, go to post office, apply, etc. The good news is I get to keep their 1st passports (their pictures were adorable). The bad news is we cannot find their birth certificates.
I got on line as the girls were both born in Texas but separate counties.
Both counties had completely different criteria (of course Dallas was the worst) and I was geting frustrated. One would accept checks the other one would not (cash or money order required, but cannot send cash through the mail

)
Anyway I kept digging and there was a Texas Office of Vital Records site where I could order the birth certificates online and pay with a credit card.

No printing out pdf forms, completing each one separately, mailing them to 2 separate places with separate forms of payment etc. One online form and done!
Now let's see if I actually get them.