REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the shareholders and Board of Directors of Lord Abbett
Developing Growth Fund, Inc.:

In planning and performing our audit of the financial statements
of Lord Abbett Developing Growth Fund, Inc. (the "Fund") as of
and for the year ended July 31, 2018, in accordance with the
standards of the Public Company Accounting Oversight Board
(United States) (PCAOB), we considered the Fund's internal
control over financial reporting, including controls over
safeguarding securities, as a basis for designing our auditing
procedures for the purpose of expressing our opinion on the
financial statements and to comply with the requirements of Form
N-CEN, but not for the purpose of expressing an opinion on the
effectiveness of the Fund's internal control over financial
reporting. Accordingly, we express no such opinion.
The management of the Fund is responsible for establishing and
maintaining effective internal control over financial reporting.
In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and
related costs of controls. A fund's internal control over
financial reporting is a process designed to provide reasonable
assurance regarding the reliability of financial reporting and
the preparation of financial statements for external purposes in
accordance with generally accepted accounting principles. A
fund's internal control over financial reporting includes those
policies and procedures that (1) pertain to the maintenance of
records that, in reasonable detail, accurately and fairly
reflect the transactions and dispositions of the assets of the
fund; (2) provide reasonable assurance that transactions are
recorded as necessary to permit preparation of financial
statements in accordance with generally accepted accounting
principles, and that receipts and expenditures of the fund are
being made only in accordance with authorizations of management
and directors of the fund; and (3) provide reasonable assurance
regarding prevention or timely detection of unauthorized
acquisition, use, or disposition of a fund's assets that could
have a material effect on the financial statements.
Because of its inherent limitations, internal control over
financial reporting may not prevent or detect misstatements.
Also, projections of any evaluation of effectiveness to future
periods are subject to the risk that controls may become
inadequate because of changes in conditions or that the degree
of compliance with the policies or procedures may deteriorate.
A deficiency in internal control over financial reporting exists
when the design or operation of a control does not allow
management or employees, in the normal course of performing
their assigned functions, to prevent or detect misstatements on
a timely basis. A material weakness is a deficiency, or a
combination of deficiencies, in internal control over financial
reporting, such that there is a reasonable possibility that a
material misstatement of the fund's annual or interim financial
statements will not be prevented or detected on a timely basis.
Our consideration of the Fund's internal control over financial
reporting was for the limited purpose described in the first
paragraph and would not necessarily disclose all deficiencies in
internal control that might be material weaknesses under
standards established by the PCAOB. However, we noted no
deficiencies in the Fund's internal control over financial
reporting and its operation, including controls for safeguarding
securities, that we consider to be a material weakness, as
defined above, as of July 31, 2018.
This report is intended solely for the information and use of
management and the Board of Directors of the Fund and the
Securities and Exchange Commission and is not intended to be and
should not be used by anyone other than these specified parties.


/s/ DELOITTE & TOUCHE LLP
New York, New York
September 21, 2018