Just a word on the carriers. My DS2 is 10 weeks, and he, just like high needs DS1 will only calm down in the Moby wrap. It's cumbersome to learn to wrap, but once you get it, it's great for calming baby. You can wear them facing forward as well. The problem I would see in your circumstance is that if they are sleeping, there is very little head support, so you often find yourself holding their head, and really only have one hand free. So, again, if your issue is that your baby needs calming, this is the carrier for you, but it has it's drawbacks.
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I also have a one of the new Beco Geminis (different from Beco butterfly). What I loved about the carrier when I bought it (before baby) was the ability to do everything the Ergo does, but with the added option of front facing, and being able to use from newborn age. Note that front-facing is only appropriate when baby has good head control. However, DS2 does not like the carrier much. It's okay sometimes, especially if I'm moving around a lot, but he doesn't look or feel as comfortable in it. Also, he's pretty big (about 15-16 lbs), but when he was smaller (12 pounds) I felt like he could just slide out the sides or something. He didn't seem very secure. But, it would definitely keep you completely hands free, and I like it better for this age than the ridiculous infant insert on the Ergo. Once baby is bigger, I love the Ergo, so I imagine I'll love this one too. Once they are bigger, the Beco Gemini will be the most comfortable carrier (definitely more comfortable than Ergo -- I wore my 33 pound almost 3 year old at 38 weeks pregnant to test it out, and it was okay!) and you will truly be hands free. I guess I'd recommend this for your circumstance, even though it might not be the most comfortable for your baby at this age. One thing that might help is putting a blanket around him first to contain him in there a bit.
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So, to answer the difference bw the Gemini & the Ergo, they are the following: Gemini is more comfortable, has more padding, has a thinner body size. The shoulder straps adjust in the front instead of further back. There is a head support for sleeping which is padded, but doesn't go very high. You can cross straps in the back or wear them backpack style (with "chest" strap in the back) for front carries. Gemini also comes with longer waist strap for larger people (Ergo you have to buy an extension). You can wear baby front facing in, front facing out, back or side. The Ergo is still quite comfortable, has a helpful front pocket, and a sleeping hood which can be used to cover up a bit while nursing (very helpful). You cannot wear baby front facing out, but can carry all those other positions. Cannot cross straps in the back. Shoulder straps adjust back-pack style (which some find hard to reach). With Ergo, have to use an infant insert for the first 3 months, which I only found comfortable with my large baby for the first couple of weeks, then there was nowhere his legs were comfortable. Without head control, I can't put him in the carrier without it, so I'm not planning on using Ergo again for a while.
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I don't have a Pikkolo so can't comment, but I have heard that the Pikkolo is less comfortable than the Gemini because there is no/little padding.
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I also have a Babyhawk Mei Tai. I like this carrier for true hands free -- he is really well supported. I can help my almost 3 year old do things when wearing this carrier. However, right now, baby is too small to have feet curled under, and not big enough for them to dangle out (it's wide), so we're on a hiatus. Also, the Mei Tai does not have padding and is not very comfortable when they weigh more (which I've heard is true about Pikkolo as well).
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Oh, and with DS2 at 10 weeks, all I can say is, at 2 months, it's even harder to put him down somewhere than it used to be! Although, luckily, he does like the swing -- sometimes. :) But, I also agree that it's okay to let them cry for a few minutes if you really must attend to another child's needs.
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Anyway, I feel for you!! I don't know how people do it!!! Two under 18 months just sounds overwhelming!! Best wishes!!!!!