How can you tell when a guppy is about to have babies?

they don't lay eggs they give live birth their bellies will bwecome bigger and bigger

and near the abdomen will be a blak spot witch will become bigger and bigger

when shes bout to deliver shell be on the bottom at the top hoverinf without moving near the heater or she can be goign up and down the sides of the tank non stop or

she could also pace 1 side to other real fast for no peticular reason 1 way is to view her at feeding time she will not eat for a week due to giving birth 1 week she wont eat if she stops it might be 1 week or less before birth they give birth to 1 to 100 or even a bit more depends put the babies in a breeder tank net or a nther tank and feed em crushed up flakes cause the pares and other fish will eat the babies due to their sall size they r 1/4 the size of the adults so be watchful lol i have raised over 80 guppies so i know what im talking bout anyway when they get double their size u can put em with the adults and they will develop color in 6 weeks or more depends on how much room and ther diet is too and if they ain't sick so gl with em i start at a very young age breedin em got rid of the lot and last year started back i started out with 1 ale 5 females and now i got in 1 year over 80 so gl with that lol