Two perfect descriptions of a baby, from Elizabeth Taylor's The Soul of Kindness:
[Flora, the baby's mother] began to dredge Alice with powder. Then she pinned her into clean napkins and handed her to her grandfather. She went out with the wet napkins... A long string of dribble swayed from Alice's mouth and attached itself to his shoulder. Her head bobbed uncertainly on its frail neck. He was afraid that she might nod it right off. Some talcum powder came off her legs onto his sleeve. With both hands needed to hold her, he could not protect himself. He kept his head back, rigid, as far from her as he could, but her face came nearer and nearer and with a sudden lurch she fell forward, her wet, open mouth pressed slobberingly against his chin.
And:
[Richard, the baby's father] bounced Alice on his knee and a thread of milk ran down her chin. Her eyes goggled and she belched; then she smiled at him, showing her two front teeth. Well, she can be sure of me, he thought. Until the day I die. And I'll see that everything she has is a damn sight better than anybody else's.
Being a parent sets mirrors around one, so that one can catch an oblique, surprising glimpse of other people, even of their previous lives. Richard suddenly saw his father as a young man, full of ambitious plans for his son, and he wondered if he, Percy, had ever danced his child on his knee, hurried home from work to do so; if he had felt this fierce protectiveness. It was one of the strangest ideas Richard had ever had, and it made him uneasy.
I'm planning to do a series of these descriptions of babies from literature -- it'll be interesting to see if we can tell which authors actually had children, or at least some experience with them, or not. If you can think of a particularly good or bad description of a baby from a work of literature, please do email me or comment.