There have been threads on this before.
Remember this is an optional alternative to points/fine.
Reasonable adjustments can and usually are made, so the mother can feed during all breaks in the course. If your baby cannot be left for 90 minutes, then this might not be an option that can be made to work. You need a nanny or similar to look after the baby when the perpetrator is actually in the sessions.
Unlike jury service, additional childcare is not publicly funded for these courses.