On average there are 105 boys born for every 100 girls. I believe it evens out in the end with more boys dying in an early age than girls, but I don't have any hard data on that.
I believe it doesn't even out until relatively late late in life, with male mortality being slightly higher at all ages. From the wikipedia article:
The "First World" G7 members all have a gender ratio in the range of 0.95–0.98 for the total population, of 1.05–1.07 at birth, of 1.05–1.06 for the group below 15, of 1.00–1.04 for the group aged 15–64, and of 0.70–0.75 for those over 65.