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This chart is a guide to what the future weight of a Chihuahua puppy might be. There are many factors that affect the final size a Chihuahua may attain upon reaching adulthood and this chart cannot predict the final outcome with full certainty. 

Birth 2.5 oz 2.75 oz 3 oz 3.5 oz 4 oz 4.25 oz 4.5 oz 5 oz 5.5 oz
1 wk 3.75 4 5 5.5 6.5 7 8 9 9.5
2 wks 5 5.5 6.5 7 9 10 11 12.5 13.5
3 wks 6 7 8 9 11 13 14 16 17.5
4 wks 7 8 9.5 11 13 15 17 19 21
5 wks 8 9 11 13 15 17 19.5 22 24
6 wks 9 11 12.5 15 17.5 20 22 24 27
7 wks 10 12 14.5 17 19.5 22 24.5 27 30
8 wks 11 13 16 19 21.5 24 27 29 33
9 wks 12 15 17.5 20 23 26 29 32 35
10 wks 13 16 19 22 25 28 31 34 38
11 wks 14 17 21 24 27 31 34 37 42
12 wks 15 19 22 26 30 33 37 41 45
13 wks 16 20 24 28 32 36 40 44 49
14 wks 17 22 26 30 34 39 43 47 52
15 wks 19 23 28 32 37 41 46 51 56
16 wks 20 25 30 34 39 44 49 54 59
17 wks 21 26 31 36 41 46 51 57 62
18 wks 22 28 33 37 43 48 54 60 65
19 wks 23 29 34 39 44 50 56 62 67
20 wks 24 30 35 41 46 52 58 64 70
21 wks 25 31 36 42 48 54 60 66 72
22 wks 25 32 37 43 49 56 62 68 74
23 wks 26 33 38 44 50 57 64 70 76
24 wks 26 33 39 45 51 58 65 71 78
25 wks 27 34 40 46 52 59 66 72 79
26 wks 27 34 40 47 53 60 67 73 80
18 mth 2 lb 2.5 lb 3 lb 3.5 lb 4 lb 4.5 lb 5 lb 5.5 lb 6 lb