Little brother or sister for the first child
Not necessarily so great for the first child
The big one learns to take responsibility for the small one.
Everything from the beginning again
The big one does not grow up alone. Both learn to share e.g.
Frequent preference for the small
If you already have a healthy first child, you will also manage the next one
Money worries don't get worse with the second child.
Siblings have, scientifically proven, no influence on personality and sharing can be learned just as well through other children of the same age....
second child is always the best
You need more space
If the first child does not get along with the second, it means nothing but stress for all involved, possibly even trauma for one child.
The mother has to take a break in her job again, or, depending on the age difference, cannot return at all