Anyone know if there are other brands of nipples that are compatible w/ medela bottles? I used medela w/ DD1 successfully and so bought all new ones for DD2. Well the newer version have a slow flow nipple that isn't very slow. Both DH and my mom commented that the milk just streams out of the nipple and DD2 has trouble keeping up. Since I have all new bottles I don't want to buy more bottles if I can find new nipples that will work.