Table 5 Comparison of secondary outcomes according to the SARS-CoV-2 delta variant

Head circumference at birth (cm) mean ± SDS

35.09 ± 0.70

35.05 ± 0.91

0.30

Head circumference 1st month (cm) mean ± SDS

37.90 ± 0.94

38.05 ± 0.91

0.92

Head circumference 6th month (cm) mean ± SDS

43.63 ± 0.80

43.78 ± 1.31

0.14

Head circumference 12th month (cm) mean ± SDS

46.63 ± 0.80

46.63 ± 1.21

0.22

Head circumference 18th month (cm) mean ± SDS

47.63 ± 0.80

47.94 ± 1.12

0.41

Head circumference 24th month (cm) mean ± SDS

49.50 ± 1.00

49.42 ± 0.78

0.71

Breastmilk intake time (/days) mean ± SDS

4.09 ± 1.64

3.57 ± 1.21

0.15

Hospitalization time (/days) mean ± SDS

12.90 ± 1.64

9.47 ± 3.83

< 0.001