The speaker is a parent-to-be, daydreaming about a daughter who doesn't exist yet. Everything is phrased with "she'd" and "if," so we know this is a picture of what might be. The details are small and loving: brown hair, hazel eyes, a smile like the sun, a pile of hoodies, green apples, books, drawing, and a delight in every dog she meets. The aside "(duh)" gives the voice a casual, joking feel, like someone chatting with a friend.
The most touching moment is the imagined tumble from a tree. The speaker guesses she'll fall because she'll be like them, then pictures her laughing it off with a toddler's "Don' worry daddy, I fine!" The ending turns to the other parent: if she's like "you," she'll be a handful, and the speaker's plans will vanish. It's said with a smile, not a complaint. The mood is warm, playful, and full of eager anticipation.