I highly recommend Morning Glory Montessori, on Bunker Hill. It's just south of I-10, just a half block from where Bunker Hill dead ends into Taylorcrest, in Bunker Hill Village. My son went there for a while when he was an infant, from about 6 weeks until he was 6 months old. I was fortunate enough to start staying home with him, so he no longer attends. But he loved it, and so did I. His teacher still babysits for him every now and then, too. They have 2 options for infants--school hours (8:30 to 3:00) and extended hours (I think 7:30 to 6?).
The director's name is Aaron.
Morning Glory Montessori
737 Bunker Hill
713-932-0126
www.montessorimorningglory.com