Background Mothers of preterm infants face many challenges in breastfeeding, especially regarding lactation. This study aimed to investigate the lactation status and challenges in breastfeeding faced by preterm infants’ mothers. Methods We approached 124 mothers who gave birth to preterm infants between 26 May and 31 October 2018 in a tertiary hospital in China. Lactation status and challenges in breastfeeding on day 7 postpartum, at discharge of infants, 2 weeks post-discharge, and 3 months of corrected age were collected using questionnaires. The area under the receiver operating characteristic (ROC) curve for expressed milk volume on day 7 postpartum for predicting expressed milk volume ≥ 300 mL/d at discharge was calculated. Logistic regression analyses were performed to identify factors associated with delayed lactogenesis II onset and continuation of breastfeeding at 3 months of corrected age. Results Seventy mothers were enrolled, and 51.4% had delayed lactogenesis II. Multivariate logistic regression analysis revealed that older maternal age (aOR = 1.19; 95% CI: 1.01, 1.40) and first live birth (aOR = 4.81; 95% CI 1.43, 16.18) were significant independent predictors of delayed lactogenesis II. Mothers with delayed lactogenesis II had significantly lower expressed milk volume (day 7 postpartum: 160.0 mL vs. 300.0 mL, U = 328.50, p = 0.001; at discharge: 425.0 mL vs. 612.5 mL, U = 372.00, p = 0.005), with a lower proportion of exclusive breastfeeding in their infants (at discharge: 33.3% vs. 69.8%, χ2 = 12.39, df = 1, p < 0.001; 3 months of corrected age: 17.8% vs. 52.8%, χ2 = 11.03, df = 1, p = 0.001). The ROC showed that expressed milk volume > 190 mL/d on day 7 postpartum significantly predicted expressed milk volume ≥ 300 mL/d at discharge. Insufficient human milk was the main reason for breastfeeding discontinuation at 3 months of corrected age. Twins were less likely to continue breastfeeding at 3 months of corrected age (aOR = 0.27; 95% CI 0.09, 0.86). In singleton infants, mother’s own milk ≥50% of total milk uptake at 2 weeks post-discharge (aOR = 32.66; 95% CI 3.00, 355.25) was an independent predictor of continuous breastfeeding at 3 months of corrected age. Feeding complications in infants, poor breastfeeding technique, and low milk output are the main challenges in breastfeeding. Conclusion Interventions to improve early postpartum lactation and breastfeeding techniques may increase breastfeeding adoption in mothers of preterm infants.
In connection with his solution of the Sensitivity Conjecture, Hao Huang (arXiv: 1907.00847, 2019 asked the following question: Given a graph G with high symmetry, what can we say about the smallest maximum degree of induced subgraphs of G with α(G) + 1 vertices, where α(G) denotes the size of the largest independent set in G ? We study this question for H(n, k), the n-dimensional Hamming graph over an alphabet of size k. Generalizing a construction by Chung et al. (JCT-A, 1988), we prove that H(n, k) has an induced subgraph with more than α(H(n, k)) vertices and maximum degree at most ⌈ √ n⌉. Chung et al. proved this statement for k = 2 (the n-dimensional cube).
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BackgroundMothers of preterm infants face challenges in breastfeeding. The aim of the study was to investigate lactation status and challenges in breastfeeding faced by mothers of preterm infants. MethodsMothers giving birth to preterm infants between May 26th 2018 and October 31st 2018 were enrolled. Lactation status and challenges in breastfeeding on day 7 postpartum, at discharge of infants, 2 weeks post-discharge, and 3 months of corrected age (CA 3m) were collected by questionnaires. ResultsSeventy mothers were enrolled, and 51.4% had delayed lactogenesis II. Multivariate logistic regression analysis revealed that cesarean section (OR=3.368, p=0.032), older maternal age (OR=1.189, p=0.008), and primiparity (OR=5.091, p=0.012) were significant independent predictors of delayed lactogenesis II. Mothers with delayed lactogenesis II had significantly lower milk output (day 7 postpartum: 160.0mL vs. 300.0mL, p=0.001; at discharge: 425.0mL vs. 612.5mL, p=0.005) and lower proportion of exclusive breastfeeding (at discharge: 38.9% vs. 70.6%, p=0.008; CA 3m: 12.5% vs. 33.3%, p=0.050). The ROC showed that milk output >190mL/d and >245mL/d on day 7 postpartum significantly predict milk output ≥300mL/d at discharge and exclusive breastfeeding at post-discharge two weeks, respectively. Insufficient human milk was the top reason for breastfeeding discontinuation at CA 3m, and mother’s own milk ≥50% of total milk uptake at postpartum two weeks (OR=5.303, p=0.007) was an independent predictor of continuous breastfeeding at CA 3m. Feeding complications in infants, poor breastfeeding techniques, and low milk output were the top challenges in breastfeeding. ConclusionInterventions to improve early postpartum lactation and breastfeeding techniques may increase breastfeeding adoption in mothers of preterm infants.
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