In my experience kids can have quite the opposite effect - I got a lot more ambitious when the first one arrived, and I've almost doubled my salary since then (a bit more than four years).
In my experience kids can have quite the opposite effect - I got a lot more ambitious when the first one arrived, and I've almost doubled my salary since then (a bit more than four years).
Where I come from this is extremely uncommon.
Sources: http://www.bls.gov/emp/ep_table_303.htm and http://stats.oecd.org/Index.aspx?DatasetCode=LFS_SEXAGE_I_R
In The Netherlands it's pretty normal to bring kids to daycare from 3 or 6 months.
In the end, there is often a salary hit though. My wife started working less. Also, there is no extra time anymore - on working days, we always go home at 17:00 sharp.
That's still not that huge a portion of a typical ~40 years career (unless you have a lot of children - I think the average for western Europe is somewhere between 1 and 2 kids) and you'd get parental leave payments during that time.
So sure it probably hurts your combined income but I think it's very rarely a 50% reduction as suggested by OP saying he needs to double his salary to stay at the same level.