I've kept track of two litters on a weekly basis, the first one seemed... really small to me which is why I started tracking weight in the first place. The second litter (out of Snow White from the first litter) grew much faster.
Possible differences:
(Litter1) Both parents of the first litter were quite large, about 10-12lbs. Natural upbringing by mother in nest box, feed a LOT of edible greens/weeds as supplements to unlimited feed. Born late spring. Experienced mother.
(Litter2) Mother was on the smaller side 8-9lbs, father is 11lbs. Litter was "shelved" in the house from day 1 until 3 weeks old. No greens/weeds, same unlimited feed. Born early Dec. Mother's first litter.
-------Litter 1 - 75% NZ 25% Cali-------
Week 4
Big Boy – 13.25 oz
Twin 1 -10.25 oz
Twin 2 -10.625 oz
Momma’s Mirror -10.375 oz
Snow White – 11.875 oz
Week 5
Big Boy – 1lb, 2.25 oz (Gain of 5oz)
Twin 1 -14.25 oz (Gain of 4oz)
Twin 2 -14.625 oz (Gain of 4oz)
Momma’s Mirror -13.875 oz (Gain of 3.5oz)
Snow White – 1lb, 0.5 oz (Gain of 4.625oz)
Week 7
Big Boy – 1lb, 10.625 oz
Twin 1 -1lb, 8.25 oz
Twin 2 -1lb, 6oz
Momma’s Mirror – 1lb, 7.5 oz
Snow White – 1lb, 7.625 oz
Week 8
Big Boy – SOLD
Twin 1 -1lb, 11.625 oz (Gain of 2.375oz)
Twin 2 -1lb, 8.5oz (Gain of 2.5)
Momma’s Mirror – 1lb, 9.5 oz (Gain of 2oz)
Snow White – 1lb, 5.875 oz (LOSS of 2oz) ??
Week 10
Twin 1 -2lb, 6.25 oz (Gain of ~11.5oz, so about 5-6 oz each week)
Twin 2 -2lb, 4.25 oz (Gain of ~11.75oz, so about 5-6 oz each week)
Snow White – 2lb, 3.25 oz (Gain of ~13.5oz, so about 6-7 oz each week)
Momma’s Mirror – SOLD
Week 11
Twin 1 -2lb, 10.875 oz (Gain of 4+ oz)
Twin 2 -2lb, 9.625 oz (Gain of 5- oz)
Snow White – 2lb, 8.625 oz (Gain of 5+ oz)
Week 12 (~estimations from week 11 & 13.)
Twin 1 -3lb, 1.25 oz (Gain of 6+ oz)
Twin 2 -3lb, 1.5 oz (Gain of 8- oz)
Snow White – 2lb, 15.625 oz (Gain of 7+ oz)
Week 13
Twin 1 -3lb, 7.625 oz (Gain of 6+ oz)
Twin 2 -3lb, 9.25 oz (Gain of 8- oz)
Snow White – 3lb, 6.625 oz (Gain of 7+ oz)
Week 14 (~estimations from week 13 & 15.)
Twin 1 -3lb, 12.50 oz (Gain of 5- oz)
Twin 2 -3lb, 14.19 oz (Gain of 5- oz)
Snow White – 3lb, 12 oz (Gain of 5+ oz)
Week 15
Twin 1 -4lb, 1.25 oz (Gain of 5- oz)
Twin 2 -4lb, 2.75 oz (Gain of 4+ oz)
Snow White – 4lb, 1.25 oz (Gain of 5+ oz)
Snow White adult weight was around 8.5 - 9lbs
-------Litter 2 - 62.5% NZ, 12.5% Cali, 25% Texas A&M-------
The smallest of this litter was sick at 4 weeks (Qwerty) so I kept her inside with me while I injected her daily, she got over it in a week but was still underweight and behind the rest for awhile.
Snow White & D’artagnan’s litter - "W" White, "B" Black, "R" Runt.
4 weeks
W5 Jeri – 11 7/8 oz.
W1 – 9 oz. (sick)
W2 – 12 5/8th oz.
W3 – 14 1/4th oz.
W4 – 13 3/8th oz.
B1 – 11 3/8th oz.
B2 – 14 5/8th oz.
B3R – 11 3/8th oz.
Avg. (minus the sick one) = 0lbs 12.78 oz.
Avg. (total) = 0lbs 12.31 oz.
5 weeks old
W5 Jeri – 1lb 1-1/8 oz. (Gained 5-1/4th oz.)
Qwerty – 15-1/4th oz. (Gained 6-1/4th oz.)
W2 – 1lb 4-3/4th oz. (Gained 8-1/8th oz.)
W3 – 1lb 6-1/4th oz. (Gained 8 oz.)
W4 – 1lb 6 oz. (Gained 8-5/8th oz.)
B1 – 1lb 2-7/8th oz. (Gained 7-1/ 2oz.)
B2 – 1lb 8 oz. (Gained 9-3/8th oz.)
B3R – 1lb 2-5/8th oz. (Gained 7-1/4th oz.)
Avg. (minus the sick one) = 1lb 4.2 oz. (Gained 7.42 oz.)
Avg. (total) = 1lbs 3.5 oz. (Gained 7.27 oz.)
5 weeks 4 days old (Left for a trip, hence the early weighing)
W5 Jeri – 1lb 7-1/8 oz. (Gained 6oz.)
Qwerty – 1lb 1-1/4th oz. (Gained 2oz.)
W2 – 1lb 13-1/2th oz. (Gained 8-3/4th oz.)
W3 – 1lb 13-3/8th oz. (Gained 7 oz.)
W4 – 1lb 11 5/8th oz. (Gained 5-5/8th oz.)
B1 – 1lb 8-5/8th oz. (Gained 5-5/8oz.)
B2 – 1lb 15 7/8th oz. (Gained 7-7/8th oz.)
B3R – 1lb 7-1/4th oz. (Gained 4-5/8th oz.)
6 weeks old -ESTIMATE
W5 Jeri – 1lb 12-1/8 oz. (Gained 11 oz. in a week)
Qwerty – 1lb 5-1/4th oz. (Gained 6 oz. in a week)
W2 – 2lb 1 oz. (Gained 12-1/4th oz. in a week)
W3 – 2lb 3-1/2 oz. (Gained 13 oz. in a week)
W4 – 2lb 1-5/8th oz. (Gained 11-5/8th oz. in a week)
B1 – 1lb 14-5/8th oz. (Gained 11-5/8th oz. in a week)
B2 – 2lb 5-1/4th oz. (Gained 13-1/4th oz. in a week)
B3R – 1lb 12-1/4th oz. (Gained 9-5/8th oz. in a week)
Avg. (minus the sickly one) = 2lbs 0.3 oz. (Gained 12.1 oz.)
Avg. (total) = 1lb 15 oz. (Gained 11.5 oz.)
6 weeks 4 days old
W5 Jeri – 2lb 1-1/2 oz.
Qwerty – 1lb 9-1/4th oz.
W2 – 2lb 4-3/8th oz.
W3 – 2lb 9-5/8th oz.
W4 – 2lb 7-1/2 oz.
B1 – 2lb 3-3/4th oz.
B2 – 2lb 10-5/8th oz.
B3R – 2lb 1-5/8th oz.
7 weeks old
W5 Jeri – 2lb 3 oz. (Gained 6-7/8th oz.)
Qwerty – 1lb 11-3/4th oz. (Gained 6-1/2 oz.)
W2 – 2lb 8 oz. (Gained 7 oz.)
W3 – 2lb 13-1/2 oz. (Gained 10 oz.)
W4 – 2lb 10-3/4th oz. (Gained 9-1/8th oz.)
B1 – 2lb 7-5/8th oz. (Gained 9 oz.)
B2 – 3lb (Gained 10-3/4th oz.)
B3R Miz Houdini – 2lb 5-1/4th oz. (Gained 9 oz.)
Avg. (minus the sick one) = 2lb 9.2 oz. (Gained 8.9 oz.)
Avg. (total) = 2lbs 7.4 oz. (Gained 7.43 oz.)
8 weeks old - "D" Doe, "M" Male.
D Jeri – 2lb 6.5 oz. (Gained 3-1/2 oz.)
D Qwerty – 2lb 3-1/4th oz. (Gained 7-1/2 oz.)
D W2 – 2lb 14 oz. (Gained 6 oz.)
D W3 – SOLD
M W4 Streak – 3lb 1/4th oz. (Gained 5-1/2 oz.)
D B1 – 3lb 1-1/2th oz. (Gained 9-7/8th oz.)
M B2 – SOLD
D B3R Miz Houdini – SOLD
Avg. (total) = 2lbs 11.5 oz. (Gained 6.5 oz.)
9 weeks old
D Jeri – 2lb 15.25 oz. (Gained 8-3/4 oz.)
D Qwerty – 2lb 12-1/4th oz. (Gained 9 oz.)
D W2 – SOLD
B Streak – 3lb 12-1/4th oz. (Gained 12 oz.)
D B1 – SOLD
Avg. (total) = 3lbs 2.6 oz.
Avg gained = 9.9 oz.
Buck gained 12 oz, does gained an average of 8.9oz
10 weeks old
D Jeri – 3lb 7 oz. (Gained 7-3/4 oz.)
D Qwerty – 3lb 6 oz. (Gained 9-3/4 oz.)
B Streak – 4lb 4 oz. (Gained 7-3/4 oz.)
Avg. (total) = 3lbs 11 oz.
Avg gained = 8.4 oz.
Buck gained 7-3/4 oz, does gained an average of 8.75oz
11 weeks old (Feb 18th)
D Jeri – 4lb 2-1/2 oz. (Gained 11-1/2 oz.)
D Qwerty – 4lb ½ oz. (Gained 10-1/2 oz.)
B Streak – 5lb 1-5/8th oz. (Gained 13 oz.) :chef:
Avg. weight = 4lbs 12.2 oz.
Avg gained = 11.875 oz.
Buck gained 13 5/8 oz, does gained an average of 11 oz