Regulars fit better (folded sideways) in wonderoos, fuzzibunz and catherine bennet pockets, and although I had already bought infants and premiums I did add 18 regulars. They are now the size I run out of first, even under a cover... they are actually the same size as the premium, but thinner in the middle. DS is at least 17# ( was in mid May anyway)... hth but I've gotta warn ya, I'm a bit of a prefold addict. I have one short of 6.5 dozen. I'm one short because I was at a picnic last weekend and a toddler fell in love with a preemie pf that I was carrying around for drool! Just a plain ubcpf, but he was just taken with it, so I gave it to him