He's not frightened Jack is really enjoying himself sitting in the bag, facing Mom and Dad. Jack's Uncle took the picture. Mom is afraid though, thinking that someone might shove him down and close it making him cry!
He is very happy, because he's got all the attention. Jack is 8 months old, and pretty hefty as babies are at that age. It never occurs to him that anyone would push him down and close the bag.
Someone took Jack's clothes off, all except for his shoes, and whether they put him in the bag or he got in himself, he thinks it's funny. It is comical to see a baby like Jack sitting in a bag like that. It's a bag that Mom and Dad had. There is a table that has a doily on it bahind hem. There is a curtain behind Jack too and and a basket on the table.