Don't male infants die slightly more, too?
That said, in devoloped nations like the US few infants die so the difference is not that large.
Edit: see page 7 http://www.cdc.gov/nchs/data/nvsr/nvsr62/nvsr62_07.pdf Per 100,000 births of each gender, 99,301 men see 1, vs 99,427 females a gap of 127. By 30 the gap is 1,148 (97,400 vs 98,548)
At 75 it's 62,720:74,464 a gap of -11,744 which is even larger when you consider the population is ~2/3 the size.
And at 100 the absolute gap is only 1,900 (997 : 2897) but there are ~3x as many woman as men.
PS: Edited the line you quoted for clarity.
Don't male infants die slightly more, too?