This ad is from Concordia's Child Services, and is clearly using shock to get the viewer to sympathize with the starvation epidemic. The quotation underneath the picture states "If you don't help feed them, who will?" Showing these filthy children trying to get sustenance from a pig is trying to get the viewers to realize how difficult of an issue this is, using an animal to show how feral, but necessary, food is to any animal. The advertiser here is well aware that people are psychological and genetically inclined to feel empathy towards infants and is using that to their advantage. The advertiser implies that if you, and you specifically, don't help this children will absolutely starve to death and it will be entirely your fault. This is, in my opinion, a completely understandable time to play the guilt card but often times advertisers will use that in unrelated ads.
In this much older ad, a baby is shown drinking Sprite, people are drawn to babies, therefore will associate their feelings of happiness towards babies with Sprite. Although the advertiser isn't exactly using guilt to sell Sprite, they are using the natural instinct that people have with babies to feel maternally or paternally towards the soda drinking infant.
Advertisers don't seem to get the credit they deserve as masters of psychology, using guilt and empathy to get you to buy things as simple as soda.