Fetal Weights for Appropriate for Gestational Age Infants

week gestation

fetal weight low

mean fetal weight

fetal weight high

23

419

468

517

24

589

660

731

25

630

666

702

26

680

712

744

27

670

714

758

28

896

951

1,006

29

996

1,038

1,080

30

1,161

1,219

1,277

31

1,151

1,240

1,329

32

1,463

1,529

1,595

33

1,554

1,603

1,652

34

1,940

2,013

2,086

35

2,167

2,220

2,273

36

2,439

2,489

2,540

37

2,666

2,719

2,772

38

2,906

2,935

2,964

39

3,118

3,140

3,162

40

3,281

3,297

3,313

41

3,295

3,329

3,363

42

3,417

3,463

3,509

43

3,749

3,925

4,101

Line

fetal weight =

low, 23 to 34 weeks

(8.733 * ((weeks)^2)) - (374.8 * (weeks)) + 4497

low, 34 to 43 weeks

(9.433 * ((weeks)^2)) - (410.6 * (weeks)) + 5050

mean, 23 to 34 weeks

(9.083 * ((weeks)^2)) - (392 * (weeks)) + 4773

mean, 34 to 43 weeks

(-4.439 * ((weeks)^2)) + (536.1 * (weeks)) - 11069

high 23 to 34 weeks

(-8.973 * ((weeks)^2)) + (881.1 * (weeks)) - 17648

high, 34 to 43 weeks

(0.091 * ((weeks)^2)) + (191.3 * (weeks)) - 4493