Why my female guppy not giving birth?

[fishy100]

Link to a short video describing the most common reasons:

 

[tanker]

She will eventually. What is the temp of you water?
When I had guppys, it was more of "How do I stop her from constantly giving birth".

 

[chenning]

The rest of the tank including mom love fry to snack on. With that busy of a tank they don't stand a chance.

 

[emeraldking]

There are also specific guppy strains which are hard to breed.