The weight chart works well as a guide to predict adult or full grown weight.  
Use as a guideline.  Although, usually accurate, there are no guarantees. This
chart was adapted for the Chihuahua, but we find it works well with yorkies as
well. First, convert your puppies weight to ounces.  Find puppy's current age in  
the left column and then follow to the right until you find your pups weight.  Next
follow to the bottom of that column to the  estimated adult weight.
Birth
 2
1/2
ounces
 2
3/4
ounces
 3
ounces
 3
1/2
ounces
 4
ounces
 4
1/4
ounces
 4
1/2
ounces
 5  
ounces
 5
1/2
ounces
1
weeks
 3 3/4
 4
 5
 5 1/2
 6 1/2
 7
 8
 9
 9 1/2
2
weeks
 5
 5 1/2
 6 1/2
 7
 9
 10
 11
 12
1/2
 13
1/2
3
weeks
 6
 7
 8
 9
 11
 13
 14
 16
 17
1/2
4
weeks
 7
 8
 9 1/2
 11
 13
 15
 17
 19
1/2
 21
5
weeks
 8
 9
 11
 13
 15
 17
 19
1/2
 22
 24
6
weeks
 9
 11
 12
1/2
 15
 17
1/2
 20
 22
 24
 27
7
weeks
 10
 12
 14
1/2
 17
 19
1/2
 22
 24
1/2
 27
 30
8
weeks
 11
 13
 16
 19
 21
1/2
 24
 27
 29
 33
9
weeks
 12
 15
 17
1/2
 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
 38
 44
 50
 57
 64
 70
 76
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
pounds
 2 1/2
pounds
 3
pounds
 3 1/2
pounds
 4
pounds
 4 1/2
pounds
 5
pounds
 5 1/2
 pounds
 6
pounds
Counter
The Rail