La fórmula para lactantes se reconstituye mezclando el polvo en que se presenta habitualmente la fórmula en España, con agua potable o envasada.

SHOULD WE BOIL THE WATER TO PREPARE FEEDING-BOTTLES?

1.- Chemical changes when boiling drinking water during 10 minutes

• The drinking water ebullition during 10 minutes increases the sodium concentration 2,5 times (Reference,pdf, 79 K) so that the reconstitution of adapted formulae with drinking water exceeds easily the top limit of permitted sodium for the European Society of Gastroenterology, Hepatology and Infant Nutrition (ESPGHAN) of 1,2 mEq/100 ml stablished with the purpose of avoiding the newborn´s kidney receiving excesive renal charge for the newborn´s kidney.

• According to a previous study (Reference pages 45 to 55), 52 of 106 spanish cities, out of all coastal zones, have drinking water with amount of sodium above 100 mg/l ,so we should chose a formula which has less than 0,8 mEq of sodium to prepare 100 ml, condition that is only reached in 5 of the 21 sold formulas in our country.

• Also, boiled water during 10 minutes in open air multiplies for 2,4 the concentration of nitrates (Reference pdf, 79 K), so that if we would boil drinking water with 23 mg/l of nitrates ( inferior amount to the permitted maximum) (Reference), it would supercede 50 mg/l (maximum tolerable value) so that there would be an additional risk of metahemoglobinaemia