if i were you, i will keep the job. I kept working when i have only 1 kid and only quit the job when i was pregnant with the second.
It is always better to earn money by ourselves than to rely on husband totally.
If you are happy with your job now, you will regret quitting it later. In addition, as you mentioned that your job is not that tense, you still have time to look after your kid after work.
My experience is that after quitting the job, i lost interest in buy clothes and stuff for myself as I only go to supermarket everyday, no need to dress up. If i keep working, i have more chances to wear beautifully.
I also enjoy being a full time mum a lot!
It's great to be able to teach and look after your own kid and see them growing up and learning new things.
I will not regret it!!!