iv
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"Harry, sweetheart, wake up!" Lily cooed over him. She'd been considering letting him sleep – they had nowhere to go, after all – but that would only make it take longer for him to take his nap and they needed for him to take his nap as usual.
James stood at her side, lifting Harry's blanket off his curled-up form and grinning. Harry pulled himself up using the side of his cot, smiling a gummy smile back at them. He spread his arms for James to pick him up.
James did so, lifting Harry above his head and bringing him back down again before laying him down to change his nappy. James was more enthusiastic about taking care of a baby than Lily'd anticipated, especially when it came to changing Harry. He was rather good at it, too, apart from his first attempt when he'd wanted to use magic to remove the dirty nappy and put on a clean one, at which point Lily enforced the rule "No magic is to be used on Harry." That didn't stop James, but he learned to keep his wand clear of Harry while in Lily's sight.
Either way, James was doing his share when it came for caring for Harry, so Lily couldn't complain, could she?
(The answer being yes, that by living in a house with James – and a miniature version of both James and Lily combined – she learned to take things one day at a time)