I don't know if you are a mother, because most mothers will agree that when it comes to a baby,
the mother is most definitely better for the baby. You keep saying that "it's not about the parents, but what is best for the child", but if the child is still a baby, it is in the baby's best interest to stay with its mother. Granted once the baby is older, it is in its best interest to have the nurture and caring from both parents, but as a baby, he belongs with his mother. Even nature knows that the mother's presence is critical in the baby's first year.
And why this case is so bizarre is because the father was not even married to the mother and quickly found himself another mate. Even in the animal kingdom, you always see the babies with the mothers, not the fathers. If McKenna had been nursing this baby, would you still be of the opinion that the judge should have taken the child from the mother to give to the father, because in your mind the father is just as important?
The survival of all animals who breastfeed their young has, throughout their long history, depended on Nature's way of keeping the mother and her young together, both for nourishment and protection. Some animals, such as lambs can follow their mothers from birth, but "higher" animals such as chimpanzees, and especially human beings, are too immature when they are born to follow their mothers in this way, and instead they are normally carried about by their mothers, at first in her arms, and later on mother's back.
For this to happen, Nature has provided a process of "bonding", so that normally a mother becomes attached to her particular baby, making her want to stay near him or her and respond to any crying or other signals. Successful bonding is helped by keeping mother and baby together in the early hours and days after delivery and breastfeeding. If they are separated at this time bonding may not occur normally. In many animals, and sometimes in humans, this may lead a mother to reject her baby. Nature's pattern seems to be that mothers and infants are designed to stay close to each other and in physical contact for much of the time, especially in the first year of life, while mother goes about her activities. Breastfeeding is part of Nature's pattern, to work with attachment behavior in developing a close, warm, and pleasurable mother-infant relationship. In humans, for better or for worse, these are the early days in a relationship which, in some form or other, will be lifelong. It may be that one day this baby will care for the mother or father.
Babies need their mothers and other carers to be sensitive and responsive to their signals. Through this responsive relationship, mother infant "attunement" normally develops, in which the interactions of mother and baby are like a coordinated "dance", which forms the basis for later communication and language development.
Attachment And Separation: What Everyone Should Know - The Natural Child Project
Yes, but she lives in New York, he lives in California. Since she was the one that gave birth and is now living in NY, and he is happily married to someone else in California, doesn't it appear selfish to you that he wants that baby traveling back and forth just so that he can spend time with him? Is he going to pay for the back and forth travel? Is he trying to escape paying child-support by wanting joint custody?
Of course she didn't want joint custody, but seeing how the courts were jerking her around, she may have changed her mind just to be able to be with her baby. I think the courts will be able to see the insanity with his demanding joint custody, and will end up granting him visitation rights, and I wouldn't be surprised to find out that he doesn't visit the baby that often, if that is all that he is given.