Secondly, they aren't white.. While some double merle dogs are almost pure white, they can go the complete range all the way up to a dog that you would think is a just a normal merle (most fall somewhere in the middle).
In between five and six months, your baby usually starts to sit up with your help, holding his head in an upright position, keeping the back straight. He may even be able to sit for a second or so without taking any assistance from you, before toppling down after a while [1] .
By 6 to 9 Months: By the time preemies reach 9 months corrected age, they should be able to sit up without support from pillows or a parent. By 10 to 12 Months: By 12 months corrected age, preemies should be able to play with a toy with both hands while sitting up without support.