Perhaps you should first investigate the question: "Has there really?" What evidence is there that there has, indeed, been a rise in multiple births? Perhaps there has been, perhaps there hasn't, but it would be better to confirm this point before going any further, searching for mysterious reasons for something that - perhaps - didn't even happen.
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In the last 400 years (since 1610) there have been 97 leap years. The most recent was 2008.
For all recorded history somebody has been born and somebody has died everyday. It seems possible that millions of years ago when the human population was very very small that a day occurred on which there were no births or deaths.
It varies depending on demand. In recent years production has been between 7 and 13 billion pieces per year. Production figures for years up to 2003 are available at the link below
The Bible reveals that only four people were sanctified by God before their births for a special purpose, including Jeremiah, John the Baptist, Jesus Christ and the apostle Paul.
17.7 and 20.9