I know it can be very hard to determine at a young age what they may be good at personality wise. Which discipline and what they may have heart into.
Yes, the confirmation plays a huge role as to what they can physically be capable of, but I also pay attention to what they may accell at in their personal interest. I know that sounds a bit wierd, as horses in general will do whats asked, but lets go beyond whats asked. Horses that have a strong interest in a specific discipline do so much better then those that are doing it just because they are asked. Their consistancy is stronger, and they actually enjoy it.
My suggestion, expose your baby to a series of events in watching. You will pick up on cues and signs that something going on has an interest. Some of mine watch the barrel races when I take them to shows and events. Some have an interest in jumping. They look at whats going on with a lot more intent, and pay attention a lot longer then they would to anything else going on, especially if it involves other horses. Horses are herd creatures and pay more attention to other horses behavior then we do. Pick up on whats normal for your baby to behave, then expose them to new things.. I am sure you will notice right away when baby can't take eyes off of a certain event, as they might find that fun to do in the future!
Dixon's Red Hot Ember