As Kevin Federline is reportedly set to launch a custody challenge for their two sons, Britney Spears has been accused of feeding the children junk food, not paying them enough attention - and asking almost two year old Sean to find “Mama’s lollipops” when she misplaces her cigarettes.

Life & Style Weekly quotes an inside source as saying: “It’s tragic what these boys are exposed to on a daily basis. Kids thrive on routine and the feeling of safety, and Sean and Jayden have neither. Their lives are subject to Brit’s whims.”

“She has a short attention span, and that applies to caring for her kids. Jayden is at a fussy stage, and when he starts crying, Brit hands the baby to a bodyguard to calm him down. When she needs a break, she gives her boys to the nearest person - even shopgirls at clothing stores!”

The source added: “When Britney and Kevin were first married, she objected to his smoking around the kids but now she smokes like a chimney in front of them.”

And when she misplaces her pack of cigarettes, she asked Sean, who turns 2 years old next month, “‘Baby, where are Mama’s lollipops?’ Sean runs, gets her cigarettes and brings them back to her.”

A second inside source, claiming to be a family member, told Us Weekly that Sean is “having dental problems because Britney just shoves a bottle of juice in his mouth all the time to stop him from crying.”

She also “feeds them total crap like Doritos and soda” and “fed Sean ice cream before bed because the cold would make him sleepy.” The source added that Britney was also spotting giving 11-month old Jayden chewing gum, even though it’s a well-known choking hazard for toddlers.

A third source added that Britney “asked an LA dentist if he would whiten her kid’s teeth!” but the dentist refused.