Each infant applies different suction pressure when feeding. It is difficult to determine exactly what the baby will receive when sucking on a bottle nipple because a breast pump is NOT similar in relation to an infant’s suck. Clinicians may want to use an article as a general guide to determine how different nipples appear in relation to each other. Reason #6 – If nipples that are intended to be used with a vented or vacuum-free system are tested in a bottle without the internal vent system, the true flow rates will not be established.įor ALL of the above reasons, it is recommended clinicians do not compare reported flow rates among different research studies. If all bottles are not provided the same amount of torque when testing each nipple, the results will vary. Reason #5 – Collar “tightening” or “torqueing” will vary the pressure within the bottle system and can increase or decrease the amount of air allowed in the bottle system. The viscosity of the liquid being tested will alter flow rates. Reason #4 – Some studies are testing the nipple flow rates with formula and some with water. Reason #3 – Each study tests a different number of nipples for each brand to determine the average flow rate and coefficient of variation. Reason #2 – The angle of the bottle is held at varying degrees. This is especially true in a faster flow nipple, such as a level 1 nipple since the hole is larger than the slower flow nipples. For instance, in the most commonly reported nipple flow rate studies, the suction pressure applied with a breast pump for liquid extraction varies with each.Ĭhanges in the pressure applied to extract the liquid can influence the flow rate of all nipples used. Reason #1 – Each study employs a different methodology to conclude their data. Why? If the authors are testing the same nipples, why not the same results? In fact, all the most widely referenced published flow rate studies have varying levels of flow rates for the same nipples. The most recent studies present different flow rates for all brands of nipples. (Abstract link: )īelow is verifiable information to better interpret the research behind “nipple flow rates.” In fact, there is a newly released article from the United Kingdom. There has been much discussion recently on the flow rates of the artificial bottle nipples, due to varying reports in some of the most recent articles published on flow rates.
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