Congratulations to you both! We've been in the same situation, so know what a struggle it is.
But do think about the lessons you've learnt about 'economising' in the last 4 months, and continue to put them to good use. It's so easy to think "we've 'gone without' for so long we'll just splash out a bit now, and cut back 'next week'.
Start as you mean to go on, from the very first week he's back at work. That way, you'll manage to save as you hope. Very best of luck to you both, and may your savings grow and grow!