Honestly, the whole thing reads like a hit piece. There are published standards for exposure levels in foods but the committee intentionally used inapplicable standards such as the much more stringent standard for purified water. Their reasoning is, "It is not sound logic to say that water is unsafe to drink if it contains over 5 ppb lead, but candy and fruit juice can be ten and twenty times higher than that limit."
The report is also full of frankly offensive conjecture. You'll find statements like, "Whether due to evasion or negligence, Sprout’s failure to respond raises serious concerns about the presence of toxic heavy metals in its baby foods," about any company that didn't respond to the committee in the way they felt appropriate.
They also repeatedly state that the levels of heavy metals in baby foods are unsafe but they never actually make a case for it. They just take it as truth and titled the report as such.
Finally, I would keep in mind that this is a congressional oversight committee staff report. This wasn't made by scientists. Nobody involved in the creation of the report has working knowledge of food safety or testing procedures. All testing in the report was provided by the companies in question. This report was made by a team of people working for the House as the foundation for proposing new laws and regulations and as such it's an inherently political report.
Frankly, after the publishing of this report it's doubtful that any company will be willing to work with this subcommittee ever again and they would be right to refuse.