Norvona,
Did you know that the roots, not the vines of Split-Leaf Philodendron (MONSTERA deliciosa)are what Tarzan used to swing through the jungle?
To answer your question: The leaves of the Monstera get very large, but
at first they are small and do not have the holes it is best known for. The more elaborate leaves begin to develop in the third or fourth new leaf. These have just a few round holes, but gradually, as more and more leaves appear they become much larger with characteristic slashes. It is a heavy, climbing
plant, as a houseplant it needs to be placed where it can be attached to a window frame, wall or trellis. Support must be sturdy. It isn't necessary to place this
plant next to a window. It tolerates the lower light levels back into a room. An east or west facing room is fine, or a bright north facing room with adequate light. Strong sun will leave ugly dried patches on the leaves. Prefers temperatures in the lower 70's, but can tolerate less in the wisnter (60's).
Likes plenty of water in the summer months when days are long, but water less in the winter. Fertilize as it is watered in the summer, about once a month. Feed less in the winter.
The other latin name for Monstera is Philodendron pertusum; some commonly call it the Swiss Cheese
plant. [Info from Success With Houseplants]
It's happening on all of them, even the oldest and original one. Help! 