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Lactation Counseling for Mothers of Very Low Birth Weight Infants: Effect on Maternal Anxiety and Infant Intake of Human Milk

^a Department of Nutrition
^c School of Human Environmental Sciences, University of North Carolina, Greensboro, North Carolina
^b Wake Forest University School of Medicine, Winston-Salem, North Carolina

OBJECTIVE. Although it is well documented that breastfeeding promotes health and development of very low birth weight (VLBW) infants, lactation initiation among mothers of VLBW infants is low. Mothers are anxious about the health of their children, and medical staff may be reluctant to promote breastfeeding out of concern for increasing that anxiety. Therefore, the purpose of this study was to examine whether mothers of VLBW infants who initially planned to formula feed were different in terms of their level of anxiety and maternal stress compared with mothers who had planned to breastfeed their infants. The aims of this study were to (1) determine whether counseling mothers of VLBW infants who had initially planned to formula feed on the benefits of breast milk would increase their stress and anxiety levels, (2) assess whether mothers who initially had not planned to breastfeed changed their plans after counseling to provide breast milk, and (3) measure the amount of breast milk expressed by mothers who initially planned to formula feed. Their results were compared with those of mothers of VLBW infants who initially planned to breastfeed.

METHODS. Initial plan to breastfeed (initial breastfeed group [IBG]; n = 115) or formula feed (initial formula feed group [IFG]; n = 81) was determined before counseling. All participants received counseling on infant health benefits, collection and storage of breast milk, and breast pump procurement. Maternal anxiety was measured using the State-Trait Anxiety Inventory (STAI), which was administered to mothers before and after counseling and every 2 weeks until infant discharge. Maternal stress was measured after counseling with the Parental Stressor Scale: NICU. Infant breast milk intake was measured throughout hospitalization. An exit questionnaire that pertained to the perceived benefits and efforts of expressing milk was administered close to the time of infant discharge.

RESULTS. After lactation counseling, 100% of the IBG and 85% of the IFG initiated breast milk expression (used the electric breast pump in the hospital) for a total lactation initiation rate of 94%. After adjustment for the mothers who initiated milk expression but did not provide any breast milk, the lactation initiation rate for the entire group was 84%. Non-Hispanic black mothers and Non-Hispanic white mothers initiated milk expression at similarly high rates (95% vs 93%). Also, milk expression initiation was similar for low-income and non–low-income mothers (95% vs 92%). IFG and IBG STAI and Parental Stressor Scale: NICU scores were not significantly different, and there were no significant differences between groups in the change in anxiety after counseling. In addition, the mean difference scores (after counseling – before counseling) for STAI anxiety "state" were not significantly different between groups, even when controlling for "trait" anxiety. State anxiety declined during the first 6 weeks of infant hospitalization in a similar manner for both groups. Maternal trait but not state anxiety scores were inversely correlated with total infant breast milk intake. Breast milk intake (mL/kg per day) was greater in the infants of mothers in the IBG compared with the IFG at each week during the first month and for their entire hospital stay. Infant breast milk intake increased from weeks 1 to 3 in both groups and continued to rise in the fourth week for the IBG. However, breast milk intake declined at week 4 for the IFG. IBG infants received breast milk for 83% of the total fed hospital days (days that feedings were given) compared with 44% of total fed days for the IFG. The proportion of enteral intake that was breast milk was also greater for the IBG compared with IFG during the first 4 weeks and for the total hospitalization. However, the mothers in IFG were able to provide at least 50% of their infants' enteral intake for the first 3 weeks, 48.8% for the fourth week, and 32.8% of the enteral intake for the entire hospitalization. Infants of low-income women received significantly lower amounts of breast milk than did infants of non–low-income mothers. Race and income accounted for 36% of the variance in breast milk intake. Of the 184 mothers who initiated breast milk expression, 72 (39%) completed the exit questionnaire. Infant health benefits were the most common reasons cited by both groups for expressing milk. The most common reasons that both groups reported for ceasing milk expression were (1) low milk supply, (2) returning to work or school, and (3) inability to pump as often as needed. Almost all of the mothers reported that pumping was worth the effort (IBG 100%, IFG 87%), and 100% said that they were glad that the staff helped them with milk expression.

CONCLUSION. Counseling mothers of VLBW infants increases the incidence of lactation initiation and breast milk feeding without increasing maternal stress and anxiety.

Key Words: very low birth weight • lactation • anxiety • counseling • human milk

Abbreviations: VLBW—very low birth weight • IFG—initial formula feed group • IBG—initial breastfeed group • STAI—State-Trait Anxiety Inventory • PSS-NICU—Parental Stress Scale: Neonatal Intensive Care Unit • WIC—Special Supplemental Nutrition Program for Women, Infants and Children

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