All of the hatchlings should be the same sex as well, females in BPs IIRC?
As far as additional info for NicoleG:
The downside being that if they're partho, the likelyhood of them thriving decreases over time. They may hatch and do well for a while, but a lot of partho babies can start failing around the age of maturity (typically 2 years in BPs). This is why you may see breeders listing that the baby was partho in their info as well.