My female Abigail is 4 and a half months old, since the 12 week mark I have been stressed about 1 or both ears standing. One week they were up, one week they were down or maybe one only etc. I got Artie my male at 20 weeks old and his ears were already up and to this day are still standing, no matter what emotions at the time! I have fed her everything from cottage cheese to calcium supplements. I find that the only way they go and stay up is to shave all of her ears, inside and the whole ear on the outside and especially the edges it makes her ears look smaller too. As short as possible!
It's best to do it every week at least every other week.
