These big baby heads were all over Rotterdam when I was there earlier this year. The sign underneath says 50 Years of de Doelen. De Doelen is a congress hall/concert venue in Rotterdam that is celebrating it's 50th anniversary this year. The dolls are an art project sponsored by the city to celebrate 75 years of rebirth after the destruction of WWII.
Thank you to biebkribels for the explanation on the baby heads and the sign. Although I like the thought behind this exhibition, the heads are a bit creepy. However, they certainly get your attention! More signs can be found here. Photos taken in May 2016.