What kind of light source did you use? Tungsten lighting will give that organish color cast to digital photos if the camera WB is set to sunlight rather than being set to tungsten lighting.
#3 needed fill lighting. The babies face is badly under exposed, but they are all sunder exposed to some degree.
Take note of Speckles edit. On a technical level, the exposure, once the white balance is accurately set, should be such that your image editing software indicates that the skin highlights are between 235 and 240 in the red channel.
Adding a gray card to the first image of each new light setup is used to set the white balance post process.