What are the Ideal Weights For My Twin Babies During the Pregnancy?

As you progress through your twin pregnancy, you’re likely going to be receiving many updates from your doctor through ultrasounds and other methods on the weights of ‘Baby A’ and ‘Baby B’.

While the chart below indicates average gestational weights for a singleton pregnancy, your twins are likely to be close in weight to the chart below if they are measuring at the average levels – our unofficial surveys of TwinStuff community members have similar weights of the singletons’ figures shown below.

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Gestational Age

Weight (gm)

Weight (lb/oz)

8 weeks

1.0 gm

0.035 oz

9 weeks

3.0 gm

0.11 oz

10 weeks

5.0 gm

0.18 oz

11 weeks

12.5 gm

0.44 oz

12 weeks

20 gm

0.7 oz

13 weeks

40 gm

1.4 oz

14 weeks

60 gm

2.1 oz

15 weeks

90 gm

3.2 oz

16 weeks

120 gm

4.2 oz

17 weeks

170 gm

6.0 oz

18 weeks

220 gm

7.75 oz

19 weeks

275 gm

9.7 oz

20 weeks

330 gm

11.6 oz

21 weeks

395.5 gm

13.9 oz

22 weeks

460 gm

1 lb

23 weeks

555 gm

1 lb 3 oz

24 weeks

655 gm

1 lb 7 oz

25 weeks

750 gm

1 lb 10 oz

26 weeks

850 gm

1 lb 14 oz

27 weeks

975 gm

2 lb 2 oz

28 weeks

1100 gm

2 lb 7 oz

29 weeks

1260 gm

2 lb 12 oz

30 weeks

1420 gm

3 lb 2 oz

31 weeks

1585 gm

3 lb 7 oz

32 weeks

1750 gm

3 lb 14 oz

33 weeks

1915 gm

4 lb 3 oz

34 weeks

2080 gm

4 lb 9 oz

35 weeks

2250 gm

4 lb 15 oz

36 weeks

2420 gm

5 lb 5 oz

37 weeks

2660 gm

5 lb 14 oz

38 weeks

2900 gm

6 lb 6 oz

39 weeks

3075 gm

6 lb 12 oz

40 weeks

3250 gm

7 lb 2 oz

The table above was taken from ‘Ultrasound in Pregnancy: A Book for Parents and Parents-To-Be’ by Dr. Applebaum. The table is just meant to be an average weight and should not be construed as medical advice of any type. The final authority on the proper weights of your babies should always be your OB-GYN doctor.

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