Traveling with wife and 17 month child on lap on a US Airways flight this weekend.

Does anyone know if US Airways counts a diaper bag as one of either a personal or carry-on bag, or if I can have both a personal and carry-on in addition to the diaper bag.

AA allows me to bring the diaper bag in addition but US Airways website seems silent on the topic.

I am a AA Plat member. No status on US.

TIA