Breastfeeding and Its Influence on Psychomotor Development: An Investigation Based on the LAyDI Study (PAPenRed).

To analyse whether breastfeeding (BF) is related to better psychomotor development in the first two years of life. Prospective longitudinal study of a cohort of children born in Spain (between April 2017 and March 2018) and followed during the first two years of life by their primary care paediatrician in eight visits (LAyDI study-PAPenRed research network). The Haizea-Llevant development chart was used to assess the psychomotor development (DPM), and the subjects were divided according to whether or not they met each milestone. The initial sample was 1946 children (50.1% boys), which varied at each visit from 1946 on the first and second visit to 1076 on the last visit; DPM at 12, 18 and 24 months was compared according to the type of BF at 6 months; at 24 months, significant differences were found in the achievement of milestones in the BF-at-6-months group ("scribbles spontaneously", 0.007 and "descends stair", 0.002). When comparing the mean duration of BF and exclusive breastfeeding, according to milestones reached or not, statistically significant differences were observed in more milestones at the 24-month visit, including "eats with a spoon" (5.6 months in the group that reached it vs. 2.4 months in the group that did not, 0.014), and again for the milestone 'scribbles spontaneously' (5.6 months vs. 1.8 months, 0.021), among others. In our study, psychomotor development in the first two years of life does not show major differences in relation to the type of feeding; from this age onwards, the differences may be greater. Many factors influence psychomotor development in the first years of life, with breastfeeding not being an isolated factor.