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] .
As your baby's neck, back, legs, and arms continue to get stronger over the next few months, he'll soon be able to sit on his own and scoot around the house. Most babies have mastered sitting up by six or seven months; crawling comes a little later. You can encourage your baby's new skill through play. If you notice him rolling over spontaneously, wiggle a toy next to the side he customarily rolls to-see if he'll try again.