Table 1.

Infant demographics (mean ± SEM)

		Birth	2–4 weeks	2–3 months
Infants, n	Male	21	20	17
	Female	29	28	29
Age	Male	39.8 ± 0.2 wk	22 ± 1 d	79 ± 2 d
	Female	39.6 ± 0.2 wk	24 ± 1 d	78 ± 2 d
Weight, g	Male	3505 ± 106	3996 ± 136	6027 ± 200
	Female	3465 ± 76	3935 ± 97	5213 ± 154

Asterisk represents significant difference between male and female infants (P <0.05).