Birth

2½ oz.

2¾ oz.

3 oz.

 3.5 oz. 

4 oz.

4¼ oz

4½ oz.

5 oz.

5½ oz.

1 week

3¾

4

5

5½

6½

7

8

9

9½

2 weeks

5

5½

6½

7

9

10

11

12½

13½

3 weeks

6

7

8

9

11

13

14

16

17½

4 weeks

7

8

9½

11

13

15

17

19½

21

5 weeks

8

9

11

13

15

17

19½

22

24

6 weeks

9

11

12½

15

17½

20

22

24

27

7 weeks

10

12

14½

17

19½

22

24½

27

30

8 weeks

11

13

16

19

21½

24

27

29

33

9 weeks

12

15

17½

20

23

26

29

32

35

10 weeks

13

16

19

22

25

28

31

34

38

11 weeks

14

17

21

24

27

31

34

37

42

12 weeks

15

19

22

26

30

33

37

41

45

13 weeks

16

20

24

28

32

36

40

44

49

14 weeks

17

22

26

30

34

39

43

47

52

15 weeks

19

23

28

32

37

41

46

51

56

16 weeks

20

25

30

34

39

44

49

54

59

17 weeks

21

26

31

36

41

46

51

57

62

18 weeks

22

28

33

37

43

48

54

60

65

19 weeks

23

29

34

39

44

50

56

62

67

20 weeks

24

30

35

41

46

52

58

64

70

21 weeks

25

31

36

42

48

54

60

66

72

22 weeks

25

32

37

43

49

56

62

68

74

23 weeks

26

33

38

44

50

57

64

70

76

24 weeks

26

33

39

45

51

58

65

71

78

25 weeks

27

34

40

46

52

59

66

72

79

26 weeks

27

34

40

47

53

60

67

73

80

18 months-full grown

2 lb.

2½ lb.

3 lb.

3½ lb.

4 lb.

4½ lb.

5 lb.

5 ½ lb.

6 lb.