If UV Express is not an option, I'd say bus. They do have courtesy seats for preggy, moms with kids and seniors. Most of the conductors ask the passengers to vacate the courtesy seats if there's a senior, preggy, mom with kids and pwds.
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I don't recommend riding the MRT, LRT's there is a high chance that your toddler will get crowded in. If you don't mind leaving earlier than the usual and getting stuck in traffic take the Bus or Fx!
You can never go wrong with either Uber or Grab. :)