my daughter is 5 mon old and i shall bring her to thailand ith my wife in Apr

do i need to apply separately for her visa (paying fees etc.) or can i apply only once for my wife and my daughter

Thaivisa.com tourist FAQ visa section might answer your question

http://www.thaivisa.com/272.0.html

my daughter is 5 mon old and i shall bring her to thailand ith my wife in Apr

do i need to apply separately for her visa (paying fees etc.) or can i apply only once for my wife and my daughter

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I have an 8 month old and had to apply seperately

does that mean double visa fees and cash requirements ?

yes, it will mean that you pay seperate visa fees.

Just out of interest, is you wife Thai?