Extra yellow on the belly of these Bumble Bees?

Hey everyone,

I recently had a Killer Spin X Normal clutch hatch. In the clutch were Bumble Bees, Pastels and a Lemon Blast

I noticed the bellies of the Bees had an extra yellow color to them. These guys are actually the first Bumble Bees I've hatched. Are these colors normal or is there possibly something extra at work?

Bumble Bee #1
https://scontent-a-iad.xx.fbcdn.net/...94021730_o.jpg
https://scontent-a-iad.xx.fbcdn.net/...37717613_o.jpg

Bumble Bee #2
https://scontent-a-iad.xx.fbcdn.net/...72091444_o.jpg
https://scontent-b-iad.xx.fbcdn.net/...93512974_o.jpg


Here are pics of the parents:
Killer Spin from Colin Weaver
http://www.iherp.com/Gallery/92194/9...3Y6MtGWY1z.jpg

Normal from Adam Wysocki.
http://www.iherp.com/Gallery/92194/3...o4GbaJl7SM.jpg

What do you guys think?

Looks right to me but I'm no expert. The parents are awesome and so are your bumble bees you can tell that they are of good quality. I think it's pretty typical to have the white sides and then fade back to yellow towards the bellies.

Right after I posted this I found Justin Kobylka's video about Yellowbelly Bumble Bees. After watching it I think it's pretty safe to rule out any Yellowbelly in them.
http://youtu.be/3WeWLc1ptto

These are among my favorite morphs and I think they're a great snake to show off to people teetering on the verge of getting into the hobby since they are so neat and colorful. I've been conducting some independent research trying to find out which morphs will appeal to non reptile people and these guys are towards the top. Congrats on them coming out really nice!