It is fairly mild here in the winter, so we were able to walk a few times most weeks all winter long. We live in a great neighborhood for walking too. The way it's laid out, you can easily go for over an hour without retracing your steps or being super far from home (this being especially handy when you are strolling a baby). Nathan is 6 months older than Cullen and is a firstborn also, so his mom and I have enjoyed comparing notes, trading coupons and recipes (wow this sounds so domestic but it's true!), and watching these two grow up side by side in their strollers.
These past couple months it has frequently been too hot to walk together, especially since Nathan's mom is pregnant! Due on Christmas eve, and it is another boy :-)