Elizabeth Olsen has given birth to her first child. The WandaVision actress was revealed to be pregnant in June and on Saturday (Aug 15), the 37-year-old star was seen out walking with husband Robbie Arnett in Los Angeles and had a baby in a white carrier strapped to her chest. Elizabeth, who was wearing white, wore a wide-brimmed hat during the outing, while the tot was kept shaded from the sun as she walked holding a second, green, piece of oversized headwear over the carrier. Last weekend, it seemed likely she had given birth because she was seen out and about in Southern California in a yellow top and striped trousers, with no…