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Expecting Multiples


What Are The Ideal Weights For My Twin Babies (during the pregnancy)?

What are the Ideal Weights for my Twins?
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.com board visitors who delivered births in 2002 and 2003 have paralleled the weights of the singletons' figures shown below. We are working towards producing a detailed survey of average twin weights during a pregnancy - if you wish to add your babies' totals to that survey, please take this link to add to the thread of information.

The below table 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.

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