Back when I was still pregnant, I wrote about prenatal yoga in this area. Since then, I've found several resources for both prenatal AND postnatal yoga here in the Pioneer Valley and wanted to share them.
The prenatal yoga classes I ended up going to were through Cooley Dickinson Hospital (at the Amherst location; there's one in Northampton as well). The classes were led by Arden and were gentle, relaxing and very informative about all things pregnancy and birth related, to boot. It was in one of those classes where I first felt my daughter move!
I feel it is quite difficult to find sufficient info on the internet for Cooley Dickinson classes, so this is kind of a rigmarole, but for Prenatal classes you can click here to view the calendar (then click on Prenatal Yoga - it will give some info & tell you to the number to call for registration).
Now that Ruby's here, I'm looking for us to go to yoga together. We haven't gone yet, but in my looking I've found a few likely candidates:
Yoga Sanctuary in Northampton offers pre and postnatal, baby-friendly classes. I know people who have been very pleased with the prenatal classes here.
Vega Yoga in Holyoke also offers an "Infant-friendly Yoga" class that doesn't seem to involve the baby, but the pre-crawler is welcomed there.
Cooley Dickinson Hospital offers Momma & Baby Yoga on Mondays and Wednesdays (again in Amherst and Northampton). This class is the only option I've found that includes the baby in the description: "Fun and therapeautic movement for baby" so it seems like a great option for us!
I'm sure there's more out there, but these can get you started!