Mother and child make the same shape
Edma’s bent near arm (left side of canvas, hand at her cheek) and Blanche’s bent little arm (inside the cradle, on the right)
Look at Edma’s near arm — elbow tucked, hand up to her cheek — then look at the baby’s bent little arm under the gauze, tucked up near her face. They are, very nearly, the same shape. Two bent elbows, two raised hands, mirrored across the divide of the veil. That match is hidden in the geometry, not declared in words — Morisot trusts you to find it.