We had short naps from 8 weeks to 5 1/2 months. I did not have energy for any extention methods, so we just went with whatever nap happened. Happily, the morning nap turned into 1 1/2 hours at 5 1/2 months. Ds would usually have 2 other short naps during the day, but what a difference! Right now (7months), the afternoon nap is longer about every fourth day. Ds did this all on his own, so there is hope!
Kim