7 months old? No sleep is normal at that age. Maybe half-hour long naps, maybe time where they'll only nap in your arms or being walked around in a pushchair if you're lucky.

I managed it with "this too shall pass" and thinking how fab my body was looking with all the extra exercise.

Liebling is 6 and still doesn't sleep through. Next time I'm just going to go with the "I like exercise" route as this doesn't pass.