~ 1.7g by 1 day old
~ 2.8g by 2 days old
~ 3.9g by 3 days old
~ 5.2g by 4 days old
~ 6.7g by 5 days old
~ 7.8g by 6 days old
~ 8.7g by 7 days old
~ 9.5g by 8 days old
~ 10.4g by 9 days old
Approximate Hatch Weights:
Order: Passeriformes
Family: Vireonidae
Common Name: Vireos
Region: Eastern
Chick Type: Altricial
Down: Sparse gray down
Skin Color: Pink to orange
Bill: Straight and pink to gray
Foot Type: Anisodactyl
Gape: Yellow
Gape Flanges: Yellow
Iris: Dark brown
Legs and Feet: Pink to gray legs and feet
~2nd Week - 8g
![](https://sites.tufts.edu/babybirds/files/2022/08/280747049_10228259902985065_3681609194408242783_n.jpg)
Photo by Trina Robinson
~2nd Week - 8g
![](https://sites.tufts.edu/babybirds/files/2022/08/281648810_10228260417277922_745345977760222758_n.jpg)
Photo by Trina Robinson
~2nd Week - 8g
![](https://sites.tufts.edu/babybirds/files/2022/08/281841984_10228259909985240_8936789612709895431_n.jpg)
Photo by Trina Robinson
~2nd Week - 8g
![](https://sites.tufts.edu/babybirds/files/2022/08/281283447_10228259902905063_7146315040726961007_n.jpg)
Photo by Trina Robinson
~2nd Week
![](https://sites.tufts.edu/babybirds/files/2022/08/284217609_10228311510515221_7263003318332112383_n.jpg)
Photo by Trina Robinson
~3rd Week
![](https://sites.tufts.edu/babybirds/files/2022/08/293644524_10228626729755505_4779135999975353912_n.jpg)
Photo by Trina Robinson
~3rd Week
![](https://sites.tufts.edu/babybirds/files/2022/08/294483406_10228626723715354_3719390664471751500_n.jpg)
Photo by Trina Robinson