NEVER put anything like that on a cover letter or application.
You want to focus on any previous employment history or job related skills that are pertinent to the position you are applying for.
If there are gaps in employment, you can address those IF asked during the actual interview.
I have been a single working mother for many, many years. I've been an office manager and worked in HR and my current job involves screening job applicants.
Starting out right off the bat explaining that you've been a stay at home mom DOES grab attention of prospective employers, but not usually in a positive way.
After my divorce, I hadn't worked in 10 years. I had a 10 year gap to overcome.
It's not unusual for women to rejoin the workforce once their kids start preschool or kindergarten so you don't need to make a big thing of it.
It may be unfortunate, but if you start off with the SAHM thing, an employer might wonder if you will be able to adjust and be happy working and juggling daycare, etc.
I am often amazed at women who apply for a job with us but then go on to say all the hours and days they can't work because they have no daycare or their kids have gymnastics, some other activity or they refuse to let anyone else pick their children up from school.
What that says to an employer is that there will likely be scheduling/attendance issues. Why apply for a full time position and then point out all the reasons you have for not being able to be there full time?
I don't get that.
I'm not saying YOU are doing that, I'm just pointing out that if you really, really want a job, you have to focus on all the reasons you will be the best and most dependable/capable candidate for the position.
Focus on all the things you did at your previous job. Focus on your best traits.
Dependable, organized, efficient, good people skills, dedicated.
Leave the personal stuff out of it.
I was recently divorced, had two kids and a 10 year gap in employment.
I have worked ever since and supported two kids by myself. Just getting your foot in that first door will open other doors for you down the line.
It's tough in this economy. Employers need to believe that you have your home bases covered and can focus on your job and be a benefit to them.
I wish you the best.