I have a toddler tornado (lol), and I blog whenever I get a free moment (I've been blogging for over 3 years now) - sometimes it might be in the evenings, sometimes early in the morning, etc. What I do is keep my laptop in command central - my kitchen - with open notepad, and I type out ideas and thoughts here and there as I go by. Some days I'll get an hour in, some days I get super lucky and get 2 or 3 - and then other days like Wednesday I barely have time to answer emails.
The best advice I can give you is to just go with the flow with your time. Remember there is no rewind button on life - your family is your priority, then your blog of course. Keep notepads and pens around where you might be in the house, so you can scribble those ideas and thoughts down, and then just finish your writing at naptime or in the evenings at bedtime. :)
I'm not a SAHM - I work a rather stressful full-time job (where my boss calls me at home or on weekends), have a near-3 year old and I find time to blog and cook homemade meals each night. You'll squeeze it in if you want to. To me, blogging is a fun, relaxing hobby. I do blog over my lunch hour at work sometimes instead of hitting the gym or while on my laptop watching a movie with the hubby. Although I prefer blogging from the desktop - mine's so much faster than my laptop!
Good luck and enjoy that baby - the time flies by so quickly!
Lately it seems that I don't! My kiddo just started pre-k, and I thought I'd have more time to blog. Seems I have less time than ever trying to get things done while she's at school for 4 hours. :)