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I think my little one was sucking in a lot of air with the calma teat, the flow seemed very fast, which caused a lot of discomfort and trapped wind, this seemed to stop immediately when I stopped using the bottles. The express machine itself is excellent but I wouldn't recommend the calma teat at least they weren't good for my little one.
La calidad de los productos se ve al nivel de medela, pero la tetina CALMA no realiza su función. Deja pasar mucha más leche que otras anticolicos de marcas como Nuk o suavinex. Además da la sensación que introduce aire por el lateral de la goma. Compre el lote por la tetina y he quedado muy defraudado
Tried them all, NUK, medela, MAM, Dr Browns, avent for our colicky 2 month old & the only one that worked was Dr Brown with cow & gate milk for colic. Baby just didn't like the shape of these nipples, the quality was great though but not for us