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Undernutrition during pregnancy in adolescence confers a high risk of maternal morbidity and adverse birth outcomes, particularly in low‐resource settings. In a secondary analysis, we hypothesized that younger undernourished pregnant adolescents (<18 years) would benefit more than undernourished pregnant adults (>20 years) from the intervention of supplementary food and anti‐infective treatments. The original trial in Sierra Leone enrolled 236 younger adolescents (<18 years), 454 older adolescents (aged 18–19 years), and 741 adults (≥20 years), all with a mid‐upper arm circumference ≤23 cm. Younger adolescents had lower final fundal height as well as smaller newborns (−0.3 kg; 95% confidence interval [CI], −0.3, −0.2; p < 0.001) and shorter newborns (−1.1 cm; 95% CI, −1.5, −0.7; p < 0.001) than adults. The intervention's effect varied significantly between maternal age groups: adults benefited more than younger adolescents with respect to newborn birth weight (difference in difference, 166 g; 95% CI, 26, 306; interaction p = 0.02), birth length (difference in difference, 7.4 mm; 95% CI, 0.1, 14.8; interaction p = 0.047), and risk for low birth weight (<2.5 kg) (interaction p = 0.019). The differences in response persisted despite adjustments for maternal anthropometry, the number of prior pregnancies, and human immunodeficiency virus status. Older adolescents similarly benefited more than younger adolescents, though differences did not reach statistical significance. In conclusion, newborns born to younger adolescent mothers had worse outcomes than those born to adult mothers, and adults and their newborns benefited more from the intervention than younger adolescents. Key messages: We performed secondary data analysis of a randomized controlled trial of a combined nutrition and anti‐infective intervention for undernourished pregnant women, investigating the effect of maternal age on maternal and newborn outcomes and response to the intervention.Despite achieving similar gestational weight gain, younger adolescent mothers (<18 years) had newborns with lower birth weights, lengths, and mid‐upper arm circumferences, as well as higher proportions of low birth weight and stunted newborns when compared with adult mothers (≥20 years).Younger adolescent mothers also derived less benefit from the combined intervention than adult mothers with respect to the rate of weight gain during pregnancy, infant birth weight, length, and rate of low birth weight (<2.5 kg).Further work is needed to identify interventions that benefit undernourished pregnant adolescents and their newborns. [ABSTRACT FROM AUTHOR]

Background There is a lack of consensus on what is the most appropriate treatment of moderate acute malnutrition (MAM). Objectives We aimed to determine if provision of ready-to-use-therapeutic food (RUTF) and antibiotics to "high-risk" MAM (HR-MAM) children in addition to nutritional counseling would result in higher recovery and less deterioration than nutrition counseling alone. Methods At the 11 intervention clinics, HR-MAM children were given RUTF and amoxicillin along with standard nutrition counseling, for 2–12 wk. All others received 6 wk of nutrition counseling alone. HR-MAM was defined as midupper arm circumference (MUAC) <11.9 cm, weight-for-age z score (WAZ) <−3.5, mother not the main caregiver, or a child <2 y old not being breastfed. Outcomes were compared using intention-to-treat analysis. Results Analysis included 573 children at the intervention sites and 714 children at the control sites. Of the intervention group, 317 (55%) were classified as HR-MAM. Short-term recovery was greater at the intervention sites [48% compared with 39% at week 12; risk difference (rd): 0.08; 95% CI: 0.03, 0.13]. The intervention group had lower risk of deteriorating to severe acute malnutrition (SAM) (18% compared with 24%; rd: −0.07; 95% CI: −0.11, −0.04), lower risk of dying (1.8% compared with 3.1%; rd: −0.02; 95% CI: −0.03, −0.00), and greater gains in MUAC and weight than did children at the control sites. However, by 24 wk, the risk of SAM was similar between the 2 arms (31% compared with 34%; rd: −0.03; 95% CI: −0.09, 0.02). Control group data identified recent illness, MUAC <12.0 cm, WAZ <−3, dropping anthropometry, age <12 mo, being a twin, and a history of previous SAM as risk factors for deterioration. Conclusions Provision of RUTF and antibiotics to HR-MAM children improved short-term recovery and reduced short-term risk of deterioration. However, recovery rates were still suboptimal and differences were not sustained by 6 mo post enrollment. This trial was registered at clinicaltrials.gov as NCT03647150. [ABSTRACT FROM AUTHOR]