For kid's soccer, I'd get a cropped sensor camera, not a full frame sensor. A full frame is a Nikon D3, D700, D800, a Canon 1Dx, 5D, etc ... Everything else is a cropped sensor. A Full Frame sensor is the same size as a 35mm piece of film, with a cropped sensor, Nikon's conversion rate is 1.5 & Canon's is 1.6, that being said, because the sensor is smaller, a 50mm lens turns into a 75mm, etc. That being said, if you get a 70-300mm, the 300mm long end is actually 450mm ... that is a super long reach, for catching the action way down at the end of the field.
I know DSLR's are bulky with all the extra lenses, but they are fast shutters, and start up rate and focusing. A pocket camera can't compare to the speed a DSLR offers.
I'm not a fan of any f/3.5-f/5.6 lens, but for daylight shooting, it's fine. If you plan on shooting at night, you need a f/2.8 lens, and anything in the 200-300mm range for a f/2.8 lens will cost you an arm, and two legs.
If you do get a DSLR, then a 35mm f/1.8 lens is a bargain at $200. The f/1.8 aperture will open up wide for nighttime shooting indoors w/o flash. the 35mm will translate to a "normal" 50mm lens to add to your lens collection. Incomparible for shooting indoors, compared to any kit zoom lens. All kit zoom lenses are the f/3.5-f/5.6 range, and f/5.6 is tiny for letting light in.
Good Luck.
FYI, I shoo a Nikon D700 F/F camera with a 35-70/2.8 & 80-200/2.8 ... the 35-70 is 30 years old, and the 80-200 is 20 years old. Sharp as a tack, both of them.
Here's a tip. Buy your camera body new, and your lens used from KEH.com ... KEH is the world's largest used camera dealer & is just right down the street from me. They've been in business over 30 years, and are top-notch quality for customer service and used lens selection. Don't be afraid of a lens in BGN condition. You'll get a great deal on a used lens. Glass is forever, and don't be afraid of that.