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] .
Q: When will my baby start sitting up? A: Your baby will probably master the skill of sitting up unassisted between 5 and 6 months. It's a slow process -- in order to sit up, your baby has to tackle a number of physical feats, including holding his neck steady and having control over his shoulders, lower back, and legs.