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I hatched 21 this time, they were mixed coturnix and I've been weighing them since hatch. They are 2 weeks old today. 14 (2/3 of total) hatched on day 18 with the remaining 7 on day 19. So some are technically 1 day younger (and it makes a big difference). The tibetans were all hatched on the second day along with 2 white and 2 browns.
At 1 day old they were between 7g and 12g.
At one week they were between 22g and 50g.
At 2 weeks they are between 54g and 108g.
The last born, a white is the 54g and the largest is a brown, maybe a jumbo, is double the size of the baby.
I have 9 whites who all average 71g (54g-85g),
9 browns average 91g (80g-108g)
3 tibetan 64g, 65g & 70g.
So you may have all coturnix, they grow at dramatically different rates.