Final answer:
The similes in lines 5-6 add natural imagery to describe a baby's play.
Step-by-step explanation:
The similes in lines 5-6 of the poem affect the meaning by adding natural imagery to describe a baby's play. The similes compare the baby's movements to ripples lapping across the water and to butterflies settling in a flower. These comparisons emphasize the beauty of the baby's play in nature, creating a sense of joy and innocence.