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] .
Before your baby is able to sit unaided, he or she may try to pull him or herself into a sitting position by pulling up on your hands. Most babies should be able to begin sitting without support between 6 and 9 months old. 1  In the first month: At first a baby cannot control the movement of his or her head and will have a rounded back that needs support in a sitting position. By the end of the first month a baby should be able to lift his or her head momentarily and turn it from side to side while lying on his or her back.