Originally Posted by [b
Quote[/b] ]i was wondering would it be impolite to call them back to check on them.
Without a doubt, YES YES YES, you should get in touch with your old customers! It's 100x's easier to resell a previous customer than it is a new prospect.
Here's what I'd do if I were you. I'd send these 18 previous customers a personal letter with a photo of the new addition, or one of the whole family, and explain the reasons why you had to let them go. You could also include some of the little details about being a father that you enjoy most. Really tug at their heart strings.
Then, make them an incredible offer for resuming service with you. Only you know your business and the numbers, so it's up to you to come up with something that will really knock their socks off but still allow you to make money. Worse case, you break even on the initial service, but hopefully your business is structured to make it up on the back-end.
Finally, since 18 is a small number I'd send them a couple of follow-up letters/postcards/flyers if they don't respond initially. If you send them something every month, they'll eventually either respond or move away.