2. The cradle should move to and from like a canoe on the waves, giving the baby a sense of security. The undulating movement maybe resembles the movement of his mother.

"The swinging doors theme, which is found all the world over, belongs most certainly to the oldest mythic tradition known to man.

The same is probably true of the swing, around which the American Indians built up a whole mythology ...; swings existed in real life, particularly among the Salish, whose various dialects distinguished between the cradle-swing - 'suspended from a long thin pole stuck in the ground and the upper end bent over ... the weight of the child being sufficient ... to allow the cradle to swing gently up and down with the movements of the child, which were kept up by a cord attached to the cradle and given to the mother or one of the old women of the household to pull from time to time' ... and the seat swing, which at least among certain groups had a ceremonial or ritual use, reserved, it would seem, for adult women ..." (The Naked Man)

The waves will transport, in myth, the divine little sun child to his destination (an event which must take place before he is old enough to roll over by himself).

Instead of referring to Moses in the Nile as an example I wish to quote from The White Goddess and from Black Canoe, which two sources are much more informative:

"... Llew visits the Castle of Arianrhod in a coracle of weed and sedge. The coracle is the same old harvest basket in which nearly every antique Sun-god makes his New Year voyage; and the virgin princess, his mother, is always waiting to greet him on the bank ..." (Link to the surrounding text in The White Goddess)

"... The Raven stole the skin and form of the newborn child. Then he began to cry for solid food, but he was offered only mother's milk. That night, he passed through the town stealing an eye from each inhabitant. Back in his foster parents' house, he roasted the eyes in the coals and ate them, laughing. Then he returned to his cradle, full and warm ..."  (Link to the surrounding text in Black Canoe)