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] .
The first stages of sitting is when baby still stabilizes herself by pressing on the floor. What this information says is that at age 7 months, roughly 70% of all babies can sit alone for short periods of up to about half a minute.