Effect of the maternity ward system on the lactation success of low-income urban Mexican women.

We compared the lactation performance of 165 healthy mothers who planned to breastfeed and gave birth by vaginal delivery, without complications to a healthy infant in either a nursery (NUR) (n = 58) or a rooming-in hospital where formula supplementation was not allowed. In the rooming-in hospital, women were randomly assigned to a group that received breastfeeding guidance during the hospital stay (RIBFG) (n = 53) or to a control group (RI) (n = 54). Women were interviewed in the hospital and at 8, 70 and 135 days post-partum (pp). The groups were similar in socio-economic, demographic, anthropometric, previous breastfeeding experience and prenatal care variables. Non-parametric survival analyses adjusting for potential confounding factors show that breastfeeding guidance had a positive impact (P < or = 0.05) on breastfeeding duration among primiparous women who delivered in the rooming-in hospital. Among primiparae, the RI and RIBFG groups had higher (P < or = 0.05) full breastfeeding rates than the NUR group in the short term. In the longer term, only the difference between the RIBFG and the NUR group remained statistically significant. The maternity ward system did not have a statistically significant effect on the lactation performance of multiparae.