I have a 13 month old. Up until he was about 6-7 months old, it was really easy to get some time in on the trainer. I used to just pop him in his pram next to me so I could give my wife a break, and do a workout or a ride. From 7 months to a year old, it was difficult. He wasn't sleeping well, my wife was back to work, etc so if I had the energy, I would do a session when everyone was asleep (I was also commuting 3 hours/day so was knackered most evenings). He's sleeping better, I commute 90 minutes a day now (some days fully by bike other days bike/train), get most of my sessions in and try to get outside for a ride with friends a couple of times/month.