Can I bring a baby stroller into the park? If so, is there a safe place to park it during the game or can we keep it with us up near the sand/grass?

Found my own answer on the website: STROLLERS Petco Park welcomes guests with strollers. However, their use must not limit guest movement or block aisles. Guests should refrain from leaving strollers unattended or storing them on the concourse or in the seating bowl. For guest convenience and ballpark safety, strollers should be checked at the Guest Services Centers located on the Field Level (Main Concourse), at Section 108, the Upper Level near Section 313, as well as the Toyota Terrace Concierge Desk adjacent to Section 208.

YES

Yes you can it's not only a ball park it's an actual park