In general, yes, that is not enough sleep, and in general 30 minute naps are really overall poor, because it is during the second sleep cycle that the baby gets restorative sleep. So minimum you want them to go through 2, 45 min cycles each nap period. A mantra around here is "sleep begets sleep" and it is sooooo true.
My daughter was doing something very similar at 5 months, and was also tied to feeding as well. My suggestion to you is something that worked for my daughter at 5 months, and I would really recommend it to you because you might see an overall improvement, although it will be challenging for awhile.
I would go the PU/PD route to extend those naps out and consolidate them. This will not only improve your lo's overall sleep (get that nighttime back up) but you will have your own time freed up as well. We also were able to get our 12 hrs back at night.
If you don't have the Tracy book "BW Solves All Your Problems" I would highly recommend getting it, as it details out extensively the PU/PD process, and also about the benefits of extending out naps and how this process will improve overall sleep.
I would also ask about feeds, how many you have and how long they are, because this for my daughter was also tied to why she was not taking long naps?
At this age, ideally you would strive for 2, 2 hr naps, and 1 45 min evening cat nap, and 11-12 hrs overnight...with maybe a dream feed or one night feed still at this age.
Let me know if you have more questions for me, as I've been through this nap extension process. I can detail out how we accomplished it. I will tell you that after 3 months of solid consistent work with Tracy's methods, and much support from my husband, we got my girl on track and she not only slept better her mood was MUCH improved....I went from having this horrible overstimulated overtired grumpy crying baby to a sweet sweet angel baby. I never realized HOW important sleep was for babies until I got us on EASY
