Hi Yan. Kids two years old and under are free, so you won't need to get a ticket for your daughter.
Yes pregnant woman are certainly allowed on the boat.
As for the optional island stop on our tour, that will begin this weekend. In the spring/fall, we run one boat tour departing every hour, on the hour. So if you took the 11am boat, the boat tour would stop by 11:30am at our dock on the islands. The boat makes a stop every hour after that, so you could catch the boat at 12:30, 1:30, etc. until 4:30 (or later 5:30 is our last island pick up). When you catch the boat on the island, you get the second half of the tour, so you will see and hear more, before making your way back to our dock on the city. So, for example, if you got on the 4:30 pick up on the islands you would be back in the city by around 4:55pm.
I hope that helps explain the tour. Thank you!
Dan Toronto Harbour T.
Apr 30, 2013