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] .
One of the first developmental milestones that new parents look forward to is the day their baby learns to sit up. Most babies will learn to sit by themselves somewhere between 6 and 8 months, however, it can happen as early as 4 months or as late as 10 months with no cause for alarm. As soon as your baby can support and control her head and has mastered rolling from back to belly, she can start learning to sit.