Money money

Looking for advice! I’m having my first child soon, I have a good paying job and so does my partner but with all our bills we have at the end of the week there’s not much left. I’m in Canada so I will be of mat leave for 1 year with 300 a week.. 600 bi weekly when I’m used to $1200 bi weekly so I’m just wondering how all of you guys manage?? After my bills are paid I won’t be able to buy groceries and then with the extra expense of a child.. I’m just worried and need some guidance ! I know everyone does it and gets through but seriously .. what a change.