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1st essay in 13 years. Disadvantages that working mothers give to their children [12]
I'm relatively certain that the overall trend of the research is against your thesis but some small subset of the research supports your thesis. When arguing a position supported by only a small subset of the relative research, it's unwise and possibly unethical to suggest that a vast body of research supports you. Better to frame your argument very carefully, stating exactly and only what you can prove.
I'm going to sort of disagree here, in that, while I have no idea of how the studies add up pro and con for your position, I am positive that there are an awful lot of studies out there that do support your position, enough for you to make the claim you do. You do have to track those studies down, though. And then you should evaluate their methodology, and read opposing studies, and evaluate their's, as you should do when researching for any persuasive essay.
To that end, try doing a Google search for "working mothers effect on children." You won't find too many studies directly, but you will find several articles that reference studies, which you can then track down. For instance:
Ones that agree with you
lifesitenews.com/ldn/2002/jul/02071807.html
guardian.co.uk/money/2003/nov/14/workandcareers
independent.co.uk/news/uk/this-britain/working-mo thers-affect-exams-690254.html
sciencedirect.com/science?_ob=ArticleURL&_udi=B6W MC-4SNWW1X-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&_do canchor=&view=c&_searchStrId=940469039&_rerunOrigin=google&_ acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=2fc3 2e844af552da5b1e741fdd2b8751
Ones that disagree with you
jiskha.com/social_studies/psychology/working_moms.html
parenthood.library.wisc.edu/Hoffman/Hoffman.html
news-medical.net/news/2005/03/29/8777.aspx
One of the advantages of doing this sort of research is that it makes you aware of nuances to the debate. For instance, a working mother who flips burgers at McDonalds and a working mother who is a supreme court justice possibly have enough differences that the effects of their being at work on their children are different too. Likewise, a working single mother is clearly not in the same situation as a married working mother who can (hopefully) rely on her husband to cover at least some of the child rearing responsibilities.
Still, I'd say you are arguing the easier side, here, as most people instinctively believe that mothers are important, and that their presence in a child's life is a positive for the child's development.