My daughter will be 6 mo. on Dec 13, She sleeps about 1- 2 hours at each nap. I think at this age they still need two big naps and a short cat nap in the late afternoon. My daughter quite often will wake after 45 min. but I don't go in. If she starts to get really wild, I go in re-swaddle put in her paci and just lay my hand on her chest and do the SHHH sound. If this still doesn't work, I will lay a light blanket over her face to block out stimulation. She just started sleeping through the night a week or so ago. This what helped us with her night wakings.
1. Increased her dream feed to 7-8oz.
2. Swaddled her tight, put her in a baby type sleeping bag. (Failling arms were a problem)
3. Wake to sleep technique outlined in book. It took about 3 nights and things have been great ever since.
I hope this helps
Kim