waitingforsomething there is evidence in the form of a study that the mother being away from their under-two-yearold for this type of period of time could be harmful.
www.ncbi.nlm.nih.gov/pmc/articles/PMC3115616/
I would tend to think this is not necessarily about the mum verses the dad but maybe about the primary carer verses the other significant carer, but I do not know this for sure.
Strictly speaking there can only be one primary carer.
My dh and I both work, me part-time, him full-time. I've always worked (since dd was 8 months old, she's now 11) and I've always been the primary carer.
I've only known of one family where care was split equally between mum and dad/ the two carers. Whether the dad stays home or the mum works part-time or one mum does more (in a lesbian couple) or any other options etc etcm there is almost always one person who is the primary carer. That relationship is in my opinion a very important thing for the child.
I am guessing as you work less than your dh, waitingforsomething, you are the primary carer (but I could be wrong).
Your departure for 10 days will be IMHO a big deal for your son, despite the fact he is his own surroundings, sees his dad (presumably at night and weekends - as normal, perhaps; as mine does) and despite the fact your ds is with his nanny.
When you return he may be a bit 'off'with you, whether he is affected long term or not, I don't know. Unlike all the people saying he will be fine, I don't know.
As you have not, perhaps, thought about the attachment issues involved I would suggest you do look into it. Of course your son is securely attached now, but if you go away for 10 days could it affect him? Just as if your dh disappeared for a period of time and you had no idea where he was you would maybe view him with suspicion when he returned.
Will baby really not know where you are? I don't know. Maybe he will, maybe you will explain it to him and he will understand. I think it unlikely but ....
My 'experience' of this is looking into attachment, as we followed an 'attachment' style of parenting with our birth child, dd (now 11) and we were told and learnt a lot about attachment with our son (who joined us by adoption aged 3, two years ago).
10 days for you is very little, for him it is a much larger percentage of his life so far. I doubt he will understand the passage of time but he will experience it none the less. Plus he will not be able to gauge days and count down to your return (as you will be able to do when thinking about him).
I am a feminist and all for women's rights, of course, and the right to work, and the right to be away from one's kids, but I would simply say to look into any potential issues and make an informed decision. Not a decision based on whether most people think it is OK or most people think it is not OK.
All the best. 