I did the BA social work few years ago but the placements are the same, 70 days and then a 100 day placement. You could be sent anywhere and it is long days so you definitely have to have good childcare in place.
I had one child in nursery for my first placement which was easier as they were used to going, But then by the time my final placement came around they were in reception which was trickier as I had ti use a combination of before and after school club and holiday club.
Kids manage the long days because after school they just have a snack and play, it's is who are exhausted working all day and studying at night.
Once you qualify and begin working you will need to use childcare as well as the hours can be long.
I would have an honest look at your support network too, is there anyone that can help you out picking kids up, or if they are sick can stay at home with them so you don't have to miss placement. If you miss days you have to make them up so that's the last thing you want to happen. Also when you qualify, if you have to work late os there someone that can pick kids up, feed them and put them to bed.
However, even when you are not on placement you may need the extra child care as lectures can be til 5pm and the days you're not at uni you'll need to study.
It is a really intense course but it's worth it in the end. But you do need to consider if long term it is the job for you because of the long hours etc.
i work in adult social care for this reason as I don't have to do late evenings. I have to pick my kids up from after school club by 5:45 and I have no back up or family support, so working in children's services is not suited to me.