Hebrews 5:13

For everyone who has to drink "milk" is inexperienced in the teaching about righteousness, for he is [still] a [spiritual] baby.

1 Corinthians 14:20

Brothers, do not be children in the way you think, but be babies in wrongdoing; yet be mature in your thinking.

1 Peter 2:2

[So], like newly born babies, you should desire the genuine, spiritual milk [i.e., God's word. See Heb. 5:12-13], so that by it you may grow toward [final] salvation,

Matthew 11:25

About that time Jesus said [in prayer], "I thank you, O Father, Lord of heaven and earth, that you have hidden these things [i.e., the significance of Jesus' words and works] from those who [thought they] were wise and intelligent and have [instead] revealed them to people who are child-like.

Mark 10:15

Truly I tell you, whoever does not welcome the kingdom of God as a little child does, that person will by no means enter it."

Romans 1:17-18

For the Gospel reveals how a person can be made right with God. It is through faith [in Jesus], from beginning to end, just as it is written [Hab. 2:4], "The righteous person will [obtain] life by [his] faith [in God]."

Romans 10:5-6

For Moses wrote [Lev. 18:5] about a person being made right with God by obeying the requirements of the law of Moses, that he would gain [never ending] life for doing this.

1 Corinthians 13:11

When I was a child I spoke, thought and reasoned like a child. But now that I have become a man, I have put away childish things. [Note: Paul uses an analogy to illustrate that the church made use of the supernatural gifts in its infancy, but that these would no longer be needed when it matured].

2 Corinthians 3:9

For if the ministry [of the law] that brings condemnation came with splendor, will not the ministry that brings righteousness [i.e., the New Agreement] have greater splendor?

Ephesians 4:14

Then we will no longer be [spiritual] babies, tossed back and forth [by waves], and blown around by every wind of [false] teaching, [deceived] by the clever trickery of people using deceptive schemes.

2 Timothy 3:16

All Scripture is inspired by God [Note: Literally, this word means "breathed out by God"] and is useful for teaching [truth], rebuking [wrongdoing], correcting [error] and for providing instruction [i.e., training] on how to live right,

1 Corinthians 3:1

And I could not speak to you, brothers, as I would to spiritual people, but [I have to speak to you] as I would to worldly people, for you are immature children in [the fellowship of] Christ.

Romans 2:20

if you are instructors of the ignorant, and teachers of babies [i.e., immature people] and possess in the law of Moses the [correct] form of knowledge and truth ---

Treasury of Scripture Knowledge

Summary

For every one that useth milk is unskilful in the word of righteousness: for he is a babe.

Bible References

The word

Romans 1:17
For the Gospel reveals how a person can be made right with God. It is through faith [in Jesus], from beginning to end, just as it is written [Hab. 2:4], "The righteous person will [obtain] life by [his] faith [in God]."
Romans 10:5
For Moses wrote [Lev. 18:5] about a person being made right with God by obeying the requirements of the law of Moses, that he would gain [never ending] life for doing this.
2 Corinthians 3:9
For if the ministry [of the law] that brings condemnation came with splendor, will not the ministry that brings righteousness [i.e., the New Agreement] have greater splendor?
2 Timothy 3:16
All Scripture is inspired by God [Note: Literally, this word means "breathed out by God"] and is useful for teaching [truth], rebuking [wrongdoing], correcting [error] and for providing instruction [i.e., training] on how to live right,

He

Matthew 11:25
About that time Jesus said [in prayer], "I thank you, O Father, Lord of heaven and earth, that you have hidden these things [i.e., the significance of Jesus' words and works] from those who [thought they] were wise and intelligent and have [instead] revealed them to people who are child-like.
Mark 10:15
Truly I tell you, whoever does not welcome the kingdom of God as a little child does, that person will by no means enter it."
Romans 2:20
if you are instructors of the ignorant, and teachers of babies [i.e., immature people] and possess in the law of Moses the [correct] form of knowledge and truth ---
1 Corinthians 13:11
When I was a child I spoke, thought and reasoned like a child. But now that I have become a man, I have put away childish things. [Note: Paul uses an analogy to illustrate that the church made use of the supernatural gifts in its infancy, but that these would no longer be needed when it matured].
1 Corinthians 14:20
Brothers, do not be children in the way you think, but be babies in wrongdoing; yet be mature in your thinking.
Ephesians 4:14
Then we will no longer be [spiritual] babies, tossed back and forth [by waves], and blown around by every wind of [false] teaching, [deceived] by the clever trickery of people using deceptive schemes.
1 Peter 2:2
[So], like newly born babies, you should desire the genuine, spiritual milk [i.e., God's word. See Heb. 5:12-13], so that by it you may grow toward [final] salvation,