But Marlou, above all remember and even stick a piece of paper with it on to the inside of the lid of your case:
People in Spain have babies too!
In the end - anything that you've forgotten or not had enough room to pack can almost certainly be bought over there and/or improvised (like the suggestion that a lightweight sarong can do double duty as a sunshade or fly net).
But seriously, it can be a good idea to keep an eye out for how the locals deal with protecting their little ones from the sun etc. After all they are doing it all the time and not just for a short holiday. For example, I soon realised that it's rare to see a Cuban Mum with a baby in a buggy - they are much more likely to carry them around in their arms or a sling and if you see a woman walking around with an umbrella up it's almost certain that she's got a baby with her and is using it as sunshade. Or even a companion walking alongside her holding it over them both. Even if you don't see a drop of rain a telescopic umbrella can be very useful - unlike a parasol designed specifically to be clipped to a buggy, an umbrella laid on its side or stuck into the sand the sand can become a personal beach parasol and/or wind break whilst your baby has a lie down. Stuck handle down in the sand and with your sarong thrown over the top its just as good as those little tents you see marketed for young babies. It's portable and big enough for Mum or Dad to be able to hold it over paddling toddlers and shade them down at the water's edge etc. Turned upside down and filled with water it becomes a personal splash pool for an older toddler to play 'pouring games' with.
SM