Foster carers and adoptive parents have a different agenda
FCS usually have a busy house with other children, either bio or fostered or even grandchildren around. Their agenda is to get the LO into a good routine and address any obvious developmental delays. to get some idea of what problems seem to be resolving with good care and which ones might need specialist input. Perhaps to deal with contact with birth family and be part of the assessment process. To look at how a child's needs might be met in permanence .
Adoptive parents are trying to build a bond of attachment for life. The usually don't have other pre school children , so can be more flexible about meeting a child's needs and spending lots of one on one time. For the child to learn who mummy is , to catch up on the 18 months of bonding they have missed ( assuming the child is a year old ) . This is precious time , you only get one chance.
No play groups doesn't mean not leaving the house for 6 month , you know. I've had quite a few children and we managed without them, they are not essential to life .
As others have said, There are plenty things to do with your child apart from that . But if You dump him in the middle of the floor with all the kids at play group and he cries, someone else will pick him up . He will learn to go to them when you want him to learn the opposite . This will reinforce his experience that adults can't too trusted to stay around .
If this is about you, as a mother, feeling that you won't survive at a Ft parent for six months, ,then that's another matter and you need to look at that and be honest with yourself . If you are someone who needs constant social interaction and lots of people to chat with all day every day , you may not like being at home with your child. That's fine, not everyone does.
You might need to agree with your partner that you split the parental leave, or you both go part time. You would need to see how that would work with your child.
But if you are planing your adoption leave to be a busy social whirl of parties, coffee mornings, play groups and shopping trips with the girls , days at the gym while baby is left with granny /the neighbour /anyone who will have him, I urge you to consider whether or not you might be better adopting a child of school age .
Newly placed Babies and toddlers need peace and time alone with mum to bond, just as you would with a new born. There a reason nature designed it this way , you know . They get 9 months inside you, then another few months of pretty much " mummy and me " time. Very few mums who have a choice leave their new babies with others until they are several months old. They think in advance that they will be expressing in week two and out for a night with the girls. But when it comes down to it, it just doesn't feel right.