this is from the sticky at the top of the forum. i too was suffering with the 45 min naps and here is what i found out and posted for others:
Problem:
My 13 week dd recently reverted to short naps. I was convinced there was something I was doing wrong and that if I could just find out what it was the short naps would be gone.
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Strategy/Result:
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Matthew's Mommy (Jane) shared some info with me that has reassured me and given me the strength to face another day of trying to extend my dd's naps.
From 0-3 months babies work on organizing their night sleep. From 3-6 they work on organizing their day sleep. What is happening is biological and is a normal blip. In the meantime, I am going to try to extend her naps with wake to sleep so that she gets used to the sensation of going from one sleep cycle to the next. I am keeping her awake time at 1.5 hours and will start moving her towards the 4 hour EASY when she is 3.5 months or so.
Jane also advised that I do a pre-wind down before all naps. So if the nap is supposed to start at 8:30, around 8:00 start walking around the house or the garden. The swaying motion of walking releases a calming hormone in the baby. Walk around until 8:15 and then start your wind down. In my wind down I rock her for a bit, turn on a lullabye, take off her clothes, change her diaper, swaddle her, and then "slow dance" with her. I may tweak the wind down/pre-nap routine but it worked well this morning.
Jane did say that it could take a while for things to get sorted out in regards to her day sleep. But I just feel so much better knowing that what is happening is not my fault and it is just biology. I also feel like I won't be as frustrated with her as it is just another part of her growing up.