If we calculate the probability of three females (FFF) should be: 0.55 x 0.55 x 0.55 =0.1664 = 16.64%.

If to 1 (total of combinations), we subtract 0.16644, shall obtain the probability of al least 1 male in the next three new born = 1-0.1664 = 0.8336 = 83.36%.