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Supertwins Statistics

Triplet Profile

Pregnancy:

* The MOST Birth Survey contains 1504 responses from triplet families.

* Pregnancy was confirmed on average at 4.1 weeks (ranging 1-35 weeks)

* Triplets were confirmed on average at 7.2 weeks (ranging 1-35 weeks)

* Triplet mothers were referred to a high-risk specialist on average at10.9 weeks (ranging 0-35 weeks)

* The average gestation of a triplet pregnancy is 33.1 weeks (ranging 16 - 39 weeks)

* The average weight gain for a triplet pregnancy is 50.2 lbs (ranging -30 - 175 lbs)

* 62% of triplet mothers in this study recevied steriod injections prior to delivery.

* 20% of triplet mothers in this survey had a cerclage performed.

Delivery:

Average birth weight for triplets is 4lbs 1oz.

Average triplet birth weights

Weight Range

NICU Stay
in days (range)

Hospital Stay
 in days (range)

Baby 1

4 lbs 3 oz

0 - 9 lbs 8 oz

18.3  (0-336 days)

22.2   (0-336 days)

Baby 2

4 lbs 2 oz

0 - 7 lbs 6 oz

18.5  (0-336 days)

22.5  (0-336 days)

Baby 3

4 lbs 0 oz

0 - 7 lbs 4 oz

19.9  (0-336 days)

23.6  (0-336 days)

Reason for delivery in triplets:

*   34.4% delivered due to labor progressing

*  21.4% were scheduled deliveries (c-section/induction)

*   13.4% delivered due to ruptured membranes (PROM)

* 14.1% delivered due to maternal complications

* 8.8% delivered due to fetal complication

*   5.3% delivered due to preeclampsia (high blood pressure)

*   The remaining 2.6% delivered for the following reasons: poor fetal growth, fetal distress, placental abruption, eclampsia, HELPP syndrome, pulmonary edema, low or high amniotic fluid levels, uterine infection, complications of twin-to-twin transfusion syndrome, umbilical cord flow problems, fetal demise, kidney failure, and other.

The average gestation for a scheduled delivery was 35.3 weeks.

The average gestation due to preterm labor and other complications 32.4 weeks.

# of Older Siblings
Average Gestation at Delivery
0
32.8 weeks
1
33.5 weeks
2
33.9 weeks
3
34.6 weeks
4
35.3 weeks
5
35.3 weeks
6
33.5 weeks

Triplet Births by Month/Season

(Note: some surveys did not give a DOB)

January
120

 25% born in Winter

24% born in Spring

25% born in Summer

26% born in Fall

February
119
March
117
April
127
May
113
June
129
July
130
August
114
September
129
October
133
November
122
December
135

Zygosity:

* 80.7% of triplets were all fraternal

* 2.9% of triplets were all identical

* 11.6 % of triplets were a combination of identical and fraternal

* 4.8% of triplets were of an unknown zygosity

 

Gender:

* 49.51% of triplets were female

* 49.36% of triplets were male

* 1.13 % gave no answer

 

Breastfeeding:

* 52% of all triplet mothers breastfed their babies for an average of 14.4 weeks.

* 30% of all triplet mothers pumped breast milk for their babies for an average of 12.5 weeks.

* Triplet mothers either breastfed or provided breast milk for their babies for a total average of 13.6 weeks.

* 48% of triplet mothers indicated having difficulty breastfeeding or pumping.

 

Location:

The state with the largest population of triplets in this survey is New York representing 20.6% of all triplet surveys followed by New Jersey at 9.3%, Texas at 5.25%, Illinios at 5.05%, and California at 5%. (For an interesting profile on why New Jersey has such a high number of triplet births, see National Geographic's 2005 Triplet Epidemic article.)

* 95.2% of the respondents to this survey lived in the US

* 1.6% lived outside the US

* 3.2% did not indicate a location

The year with the most triplet births in this survey was 1996 with 180 triplets. (See table below for more details.)

Year 19**
Year 20**
Year
84
86
87
88
89
90
91
92
93
94
95
96
97
98
99
00
01
02
03
04
05
06
07
Count
4
4
13
13
22
32
38
65
66
105
122
180
102
132
134
92
103
118
65
35
21
13
3

(Note: 18 triplet surveys did not give a date of birth and 6 triplet surveys indicated a date of birth prior to 1984.)

 

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Other MOST Medical Birth Survey Data

Updated 06/22/07

 
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