Do it!! Assuming you can find daycare, there are some really big positives.
1.- Taking home half your wage to start with is nice, and more than some mums start with. But this is a starting position, likely to improve over time, whereas daycare costs are likely to stay where they are more or less. As soon as you start being paid like a professional instead of a graduate, that is going to start making a big contribution to your stache. Don't forget that if your OHs pay is currently covering all your expenses, then ALL of your pay after tax and DC can be investments. That's awesome!
2. Honestly, I think there is a sweet spot with leaving your child with strangers, it's extremely difficult when they are tiny, but only for you as they are so adaptable that they might cry at first but are really going to be ok! If you wait too long then they have trouble coping without you. I had to go back to work when bub was 6 months, and I couldn't have done daycare that young, but leaving her with her grandparents was bearable. By 9 months daycare was ok. I see other mums who had their kids at the same sort of time who, now that their child is 2 has barely ever been away from mum unless it's with dad, and I don't think they could cope with starting daycare now (either mother or child), so they are setting up a really tough situation for preschool. You know that leaving your little one with strangers is inevitable eventually, at 1 they are still pretty adaptable but also less needy of 1 on 1 so to me, it's a great time to start daycare. Most centres near us with let you do a half day trial to see how the child goes, so that's something you might want to look into. I'm really pleased at how independent my daughter is, she is comfortable in so many different environments, and has lots of people she loves. But of course Mummy is still special, don't be afraid that you will lose that because it won't happen.
3. You don't say if a second child is in the plan, but if it is, it's much better to get some work experience on your CV, rather than finishing school, then taking another year or two with second baby, and THEN trying to get a job. If you are already experienced, another career break is less of a big deal.
4. Not knocking long term SAHPs, because I know that's the right thing for some people, but if that isn't your personality, then it's best not to get locked into it by default of being out of the workforce too long. Frankly, being a full time SAHM for much longer than my 6 months would have severely impacted on my mental health - having a job / paying my way is too important for my self worth. Plus I felt like I was losing a lot of workplace skills - I felt so dumb when I went back to work. It took me probably a year - until my boss actually told me I was doing a good job - to feel like I was any good at my job again. It can only get harder the longer you leave it.
TL:DR It's good for you to get back into work, it won't harm baby, and the financial benefits are more than just your current paycheck.