Speak to a travel agent there are lots of cruises for families let the agent do the work then shop aroun.
Do not really understand your your question!? we also have a daughter and have no problem finding a cruise to suit us, how old is your daughte.
If you read the small print in the brochure it will show the price for the 3/4 person in the cabin....
Some cruise lines offer free child places. For instance Cunard are offering free child place on transatlantic. P&O are offering a number of free 3/4 places free next year although they are getting rather full. Keep an eye out for them at:- http://www.manchestercruisecentre.com/freechildplaces.php
Most cruise companies offer 3/4 birth cabins although they do tend to get booked up rather quickly. Kind regard.