Dear {Name},
I'm so sorry for waking the baby! Poor little thing. I had no idea that the baby {was sleeping/needed to nap/was home/is such a light sleeper}.
I totally forgot {naptime/schedule/sign on the door}.
When {Name} is a little older and if you're OK with it, I'd like to make it up to you with free babysitting. In the meantime, I've enclosed {baby gift}. I'd also like to recommend {white noise machine/music/being loud}. I know that helped with {my baby/a baby I know}.
Sincerely
{Name}
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Index of letter of apology templates