Table 3.

Differences across years in birth weight measured in 500-gram intervals for live births (2019 is the reference year)

	January	February	March	April	May	June	July	August	September	October	November	December
Year	Regression estimates (Standard errors)
2016	0.013*	0.019**	0.041**¥	0.007	0.030**¥	0.013*	0.022**¥	0.050**¥	0.045**¥	0.049**¥	0.040**¥	0.054**¥
	(0.006)	(0.007)	(0.006)	(0.007)	(0.006)	(0.007)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)
2017	0.005	0.031**¥	0.031**¥	0.019**	0.023**¥	0.034**¥	0.028**¥	0.045**¥	0.027**¥	0.040**¥	0.034**¥	0.054**¥
	(0.006)	(0.007)	(0.006)	(0.007)	(0.006)	(0.007)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)
2018	0.008	0.006	0.021**¥	0.017**	0.026**¥	0.017**	0.022**¥	0.027**¥	0.015*	0.020**	0.021**¥	0.033**¥
	(0.006)	(0.007)	(0.006)	(0.007)	(0.006)	(0.007)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)
2019	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.	Ref.
2020	-0.032**	-0.017*	0.008	0.031**¥	0.042**¥	0.039**¥	0.025**¥	0.024**¥	0.025**¥	0.025**¥	0.029**¥	0.034**¥
	(0.006)	(0.007)	(0.007)	(0.007)	(0.007)	(0.007)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)
Observations	247,902	224,528	247,423	239,244	246,938	238,261	250,048	256,767	269,938	260,344	250,148	249,693

Regression estimates are on the 0–1 probability scale, and they can be multiplied by 500 to approximate the differences in grams

Estimates are rounded to the third decimal

** p < 0.01, * p < 0.05

^¥ Statistically significant after Bonferroni correction