Vote Inflation?

When citizen population of a democratic country rises, the vote of an always existing citizen counts "less" during an election. In the US, only the house tries to have members proportional to the population. The senate and the executive branch however have fixed number of members, so each senator or the president will have more and more voters. Since their votes count less, does this mean that a citizen effectively loses power over time? This surely means that if you want to influence the political setting of a country, you should have lots of children and teach them your political beliefs :^)