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Summary of your baby's growth during pregnancy.

How much weight should your partner gain during her pregnancy?

Exceptions to the general weight gain rules in pregnancy.

What makes up the extra weight gained whilst pregnant?

How much weight should be taken at each stage of pregnancy?

Summary of your baby's growth during pregnancy.

Try out the Weight Gain Calculator

This graph shows the weight and size of a foetus as it grows in the womb. Notice how the weight gain is more rapid towards the end of the pregnancy whilst the linear growth remains fairly steady throughout. Details follow in the table below.

The table below shows the details of these averaged sizes of a growing baby during the 38 weeks of pregnancy:

Time from conception	Weight in metric	Size in metric	Weight in pounds	Size in inches
2 weeks		0.1 to 0.2 mm
3 weeks		0.2 to 0.5 mm		0.01
4 weeks		4 to 5 mm		0.16
5 weeks		5 to 7 mm		0.20
6 weeks	1.5 g	9 to 14 mm		0.39
7 weeks	2 g	17 to 22 mm		0.79
8 weeks	3 g	3.0 cm	0.01	1.18
9 weeks	10 g	5.5 cm	0.02	2.17
10 weeks	20 g	7.5 cm	0.04	2.95
11 weeks	30 g	8.5 cm	0.07	3.35
12 weeks	45 g	10.0 cm	0.10	3.94
13 weeks	65 g	12.0 cm	0.14	4.72
14 weeks	110 g	14.0 cm	0.24	5.51
15 weeks	135 g	16.0 cm	0.30	6.30
16 weeks	160 g	17.5 cm	0.35	6.89
17 weeks	200 g	19.0 cm	0.44	7.48
18 weeks	250 g	20.0 cm	0.55	7.87
19 weeks	270 g	21.0 cm	0.59	8.27
20 weeks	380 g	22.5 cm	0.84	8.86
21 weeks	450 g	24.0 cm	0.99	9.45
22 weeks	500 g	26.0 cm	1.10	10.24
23 weeks	550 g	28.0 cm	1.21	11.02
24 weeks	650 g	30.0 cm	1.43	11.81
25 weeks	750 g	32.0 cm	1.65	12.60
26 weeks	850 g	33.0 cm	1.87	12.99
27 weeks	1000 g	34.0 cm	2.20	13.39
28 weeks	1150 g	35.0 cm	2.53	13.78
29 weeks	1300 g	36.0 cm	2.86	14.17
30 weeks	1500 g	37.0 cm	3.30	14.57
31 weeks	1700 g	39.0 cm	3.74	15.35
32 weeks	1900 g	40.5 cm	4.18	15.94
33 weeks	2100 g	42.0 cm	4.62	16.54
34 weeks	2300 g	43.0 cm	5.06	16.93
35 weeks	2500 g	45.0 cm	5.50	17.72
36 weeks	2700 g	46.5 cm	5.94	18.31
37 weeks	2900 g	48.0 cm	6.38	18.90
38 weeks	3000 g	50.0 cm	6.60	19.69

How much weight should your partner gain during her pregnancy?

Exceptions to the general weight gain rules in pregnancy.

What makes up the extra weight gained whilst pregnant?

How much weight should be taken at each stage of pregnancy?

Summary of your baby's growth during pregnancy.

Try out the Weight Gain Calculator

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