Prolonged pacifier use during infancy and smoking initiation in adolescence: evidence from a historical cohort study

Breastfeeding in the First Hours of Life Protects Against Pacifier Use: A Birth Cohort Study

Objective: To investigate risk factors for pacifier use in the first year of life. Materials and Methods: A prospective cohort study was conducted with children enrolled at birth in Porto Alegre, Southern Brazil, whose mothers underwent prenatal care at primary care units. Soon after the birth of the children, data were collected on anthropometrics, type of childbirth, and time until breastfeeding on the first day of life. At 6 and 12 months of age, data were collected on breastfeeding practices and whether the child had used a pacifier in the previous 6 months. Statistical analysis involved the use of Poisson regression with robust variance. Results: The incidence of pacifier use in the first year of life was 60% (317/532). The multivariable analysis showed that pacifier use in the first year of life was 33% higher when the mother was younger than 18 years of age (relative risk [RR] = 1.33; confidence interval [95% CI]: 1.01-1.76). Infants who breastfed in the first 30 minutes after birth had a 25% lower risk of pacifier use in the first year of life (RR = 0.75; 95% CI: 0.60-0.94), and those who breastfed between 30 minutes and 6 hours after birth had an 18% lower risk (RR = 0.82; 95% CI: 0.69-0.97) compared to those who took longer to begin breastfeeding or did not breastfeed. Conclusions for Practice: Breastfeeding soon after being born protected against pacifier use in the first year of life. This finding suggests pathways to improve child health, especially in the prenatal period and with an emphasis on pregnant adolescents.

Exclusive breastfeeding changes in Brazil attributable to pacifier use

BACKGROUND

Identifying key interventions to increase exclusive breastfeeding duration has been a challenge. Pacifier use has been associated with exclusive breastfeeding discontinuation in Brazil. However, the proportion of the improvement in exclusive breastfeeding duration attributable to pacifier use remains unknown.

RESEARCH AIM

Quantify the proportion of increases in exclusive breastfeeding prevalence that can be attributed to reduced pacifier use over time.

METHODS

Secondary data analyses of two nationally representative cross-sectional surveys conducted in States' capitals in 1999 and in 2008 (N = 42,395 Brazilian infants under 6 months of age). We estimated the fraction of exclusive breastfeeding prevalence improvements that could be attributed to pacifier use based on multilevel regression analysis.

RESULTS

From 1999 to 2008, there was an increase of 15.2 percentage points in exclusive breastfeeding prevalence and a decrease of approximately 17 percentage points in the prevalence of pacifier use among infants under 6 months. Reduction in pacifier use explained an increase in 5.5 percentage points' exclusive breastfeeding rates. If pacifier use were to decrease from 41.6% (prevalence in 2008) to 14% (as found in New Zealand), there would be an expected additional increase in exclusive breastfeeding of approximately 12 percentage points.

CONCLUSIONS

About one-third of the improvements in EBF prevalence observed in Brazil over a decade can be attributed to the corresponding decline in pacifier use.

Pacifier Use and Early Life Weight Outcomes in the Intervention Nurses Start Infants Growing on Healthy Trajectories Study

BACKGROUND

Although widely used by infants, little is known about the long-term effects of pacifiers. We investigated relationships between pacifier use in infancy and appetite, temperament, feeding, and weight outcomes through age 2 years using data from the Intervention Nurses Start Infants Growing on Healthy Trajectories study.

METHODS

Mother-newborn dyads were randomized to a responsive parenting intervention for obesity prevention or a control group. Infants with data on pacifier use (n = 250) were categorized as using a pacifier beyond early infancy (≥4 months of age) or not. Anthropometrics were measured at 6 months, 1, and 2 years with overweight defined as weight-for-length ≥95th percentile at 1 year and BMI ≥85th percentile at 2 years. Mothers completed questionnaires on temperament, appetite, and feeding.

RESULTS

Infants who used a pacifier at 4 months or later (68%) had greater conditional weight gain from birth to 6 months (p = 0.01), weight-for-length z-score at 1 year (p < 0.001), and BMI z-score at 2 years (p < 0.001) than infants who did not. Infants using a pacifier at ≥4 months were more likely to be overweight at ages 1 year (11.7% vs. 1.3%, p = 0.03) and 2 years (20.1% vs. 7.9%, p = 0.03). Pacifier use was associated with shorter breastfeeding duration and less responsive parent feeding styles, but these variables did not mediate the relationship between pacifiers and weight. Parent-reported temperament and appetite were unrelated to pacifier use.

CONCLUSIONS

Pacifier use beyond early infancy is associated with accelerated infant growth and toddler overweight, although the reasons for this relationship are unclear.

Pacifier Use and Exclusive Breastfeeding in Brazil

BACKGROUND

Exclusive breastfeeding (EBF) rates for infants younger than 6 months have increased in Brazil, although at the current pace of improvement it would take 6 years to reach an EBF rate of 50%. Thus, it is important to identify relevant modifiable key risk factors for the premature interruption of EBF.

OBJECTIVE

This study aimed to find out if pacifier use is an independent risk factor for the interruption of EBF among Brazilian infants.

METHODS

We conducted secondary cross-sectional data analyses of 2 waves of infant feeding surveys conducted in 1999 and in 2008 in the Brazilian state capitals and Federal District (N = 42 395 children < 6 months). Multivariate logistic regression was used to test the association between pacifier use and the risk of interruption of EBF in a pooled sample and within each survey wave, adjusting for socioeconomic, demographic, and biomedical confounders.

RESULTS

In the pooled sample, a third of the infants were exclusively breastfed (32.7%) and almost 50% had used a pacifier. Whereas EBF prevalence among infants increased from 25.1% in 1999 to 40.3% in 2008, pacifier use prevalence decreased from 58.5% to 41.6% in the same time period. Pacifier use was strongly associated with the risk of interruption of EBF in 1999 (adjusted odds ratio [AOR] = 2.65; 95% confidence interval [CI], 2.38-2.94), in 2008 (AOR = 3.18; 95% CI, 2.81-3.60), and in the pooled sample (AOR = 2.77; 95% CI, 2.63-2.91) after adjusting for key confounders.

CONCLUSION

Pacifier use was the strongest risk factor for EBF interruption. Effective strategies to reduce pacifier use among infants younger than 6 months may further improve EBF rates in Brazil.