Weight at birth	2½ oz	2¾ oz	3 oz	3½ oz	4 oz	4¼ oz	4½ oz	5 oz	5½ oz
1 Week	3¾	4	5	5½	6½	7	8	9	9½
2 Weeks	5	5½	6½	7	9	10	11	12½	13½
3 Weeks	6	7	8	9	11	13	14	16	17½
4 Weeks	7	8	9½	11	13	15	17	19½	21
5 Weeks	8	9	11	13	15	17	19½	22	24
6 Weeks	9	11	12½	15	17½	20	22	24	27
7 Weeks	10	12	14½	17	19½	22	24½	27	30
8 Weeks	11	13	16	19	21½	24	27	29	33
9 Weeks	12	15	17½	20	23	26	29	32	35
10 Weeks	13	16	19	22	25	28	31	34	38
11 Weeks	14	17	21	24	27	31	34	37	42
12 Weeks	15	19	22	26	30	33	37	41	45
13 Weeks	16	20	24	28	32	36	40	44	49
14 Weeks	17	22	26	30	34	39	43	47	52
15 Weeks	19	23	28	32	37	41	46	51	56
16 Weeks	20	25	30	34	39	44	49	54	59
17 Weeks	21	26	31	36	41	46	51	57	62
18 Weeks	22	28	33	37	43	48	54	60	65
19 Weeks	23	29	34	39	44	50	56	62	67
20 Weeks	24	30	35	41	46	52	58	64	70
21 Weeks	25	31	36	42	48	54	60	66	72
22 Weeks	25	32	37	43	49	56	62	68	74
23 Weeks	26	33	38	44	50	57	64	70	76
24 Weeks	26	33	39	45	51	58	65	71	78
25 Weeks	27	34	40	46	52	59	66	72	79
26 Weeks	27	34	40	47	53	60	67	73	80
18 Months (Adult)	2 Pounds	2½ Pounds	3 Pounds	3½ Pounds	4 Pounds	4½ Pounds	5 Pounds	5 ½ Pounds	6 Pounds