Children are heavy, especially when you have twins and you have to schlepp them around in those infant car seats because you can't fit your double stroller through the doorway of your local coffee shop. I remember discovering this dismal fact on one of my first outings with the twins and then having to stand outside the coffee shop pathetically peering through the windows until the barista saw me salivating out there and came outside and took my order. Which she finally did. Which is why you should always support your local coffee shop.
But I digress.
People used to comment about how I was getting such a great work out in by carrying the kids around in their car seats and about what a great upper body workout it must be was but that was all bunk, seven years later I can't see that it's done me much good. I even tried putting of the twins in the baby Bjorn front pack and the other in the LL Bean backpack and wearing them both - what a freak show that was.
Even in the double stroller they were heavy. Mostly because their two older brothers would try to get away with sitting on the front until I'd notice and shoo them off.
It's odd because they were so light when they were born at 5lbs each. "Like loaves of bread," my husband commented when we were still in the hospital with them thus forever cementing the old outdated "bun in the oven" adage in reference to pregnant women.