I agree with Tank - you really won't know until you get there. There are things you need to think about and decisions you can make to narrow the field, but ultimately you have to be flexible for your kids' needs.Â
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Will the kidlets be put into daycare? Many daycares will only accept pockets or AIOs if they accept CDs at all.
Do you have your own washing machine or use shared facilities? For shared facilities I'd avoid all synthetics.
Do you have to line dry? I'd stick with flats and pockets.
Is budget a big concern? Flats or pfs are the way to go.
Do you want a OS dipe that will grow with the kids, or would you prefer a sized dipe (if you're planning more kids, sized tend to last better)?Â
Do you want all natural fibers or do you want a dipe that will feel dry against their skin (synthetics)?Â
How often do you want to be doing laundry, and how complex of a wash routine are you willing to commit to? AIOs tend to be the most difficult to wash, where flats are the easiest. Number of dipes will effect frequency of washing, but budget effects number.Â
Velcro or snaps? With twins I'd avoid velcro, honestly. It wears quicker.
2-piece system (pfs/fitteds w/ cover) or 1-piece (pocket/AIO)?
Customizable absorbency (pocket) or fixed?
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There are many more things to think about, but that's a good start. Twins often come out smaller than singletons, and grow slower as well that first year, but you're not going to know that until they get here. With my singleton we went through dozens of brands to find one that would fit him properly (snug around the legs to contain poo) until he started chunking out around 9 mos.Â
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Honestly, unless budget is no issue, with twins I would probably go for PFs and cover until they're walking. They're a little more difficult to get on, but you can have more of them (for less money) and they wash so much easier. They also will fit any baby (skinny, chubby, skinny legged, chubby legged, etc.) with a little practice. I'd go with the GMD sized pfs. There's definitely a learning curve, but I'd practice a bit on a stuffed animal or doll before they arrive so you have the general idea, and you'll learn from there. Have plenty of covers on hand (you may even want preemie covers - my 8 lber was too small for NB covers at birth). Once they're walking, I'd reassess and decide if you want to stick with the pfs until PLing or switch to something like pockets which are easier to use. I can change my guy while standing in a pocket, but a PF requires him to lie down and hold still, which he's not so good at most of the time.Â
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I just can't imagine the laundry frequency or stuffing all those pockets with infant twins - with a 2 yo singleton I have a perpetual basket of diaper laundry on my coffee table, and he only goes through 5 or 6 a day. With PFs, I can just plop them into a stack and move on in about a minute.Â
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HTH