Picking lotto numbers solely from birth dates has a 'secondary' disadvantage in that most players do it and most likely you will have to share the jackpot with many other winners. It is better to always include in your selections at least one high number.
It's not just the jackpot you can win. There are several other smaller prizes included in the draw. If you win, you must keep most of the winnings to yourself. Replaying all your winnings, however small, will not get you anywhere.
Don't forget that winning the lottery jackpot is sheer luck. One set of numbers is enough to win it. A few more selections may give you more hope and make you feel better, which is not bad. Playing too many selections is gambling against very high odds. Not a wise thing to do on a regular basis.
Remember, although the odds of winning the lottery jackpot are huge, you only need to win it once. Besides, ordinary people win it at every draw. You could be next.