Ergos are totally worth it.
I think some of the biggest pros with an Ergo are:
1. super fast and easy to put on
2. easy to adjust between users (DH is 5'10" and I am 5'0")
3. Depending on the color you choose, they are probably the most appealing carrier to most men
4. they have a handy little zipper pouch that will fit a diaper or a toddler snack
5. as your child gets older, you can use the back carry. This has been BY FAR the most useful way to carry for us. We started using ours when DS was about 1 and he still rides on our backs often (he will be 3 in two months)
6. it is ridiculously comfortable. Case in point, I am 8 months pg now, and DS weighs 38 pounds. The Ergo is so comfortable that I still carry him on my back occasionally.
You may not need an Ergo right away, since you have several other carriers, but consider one around 6+ months....
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