- 107 - The Committee is concerned that the institutionalization of children is used systematically. The Committee acknowledges that there has been a general agreement that the family environment provides the best possibilities for the harmonious development of the child, but between the family of origin and the placement in institution, options have to be found. These options could include the traditional placement in the family or in the extended family, open centres, the placement for day or night, emergency placement, temporary stay solutions, etc. Many of these options already exist.559 Cf. Guidelines for the Alternative Care of Children, attached to UN General Assembly Resolution 64/142 , February 24, 2010, UN Doc. A/RES/64/142, para. 5. 554 Cf. Guidelines for the Alternative Care of Children, attached to UN General Assembly Resolution 64/142 , February 24, 2010, UN Doc. A/RES/64/142, paras. 6 and 7. 555 Cf. Guidelines for the Alternative Care of Children, attached to UN General Assembly Resolution 64/142 , February 24, 2010, UN Doc. A/RES/64/142, para. 54. 556 557 Cf. Convention on the Rights of the Child, art. 20.2. Cf. Committee on the Rights of the Child, General Comment No. 21 on children in street situations, June 21, 2017, UN Doc. CRC/C/GC/21, para. 45, and Committee on the Rights of the Child, General Comment No. 3: HIV/AIDS and the rights of the child, March 17, 2003, UN Doc. CRC/GC/2003/3, para. 35. 558 Committee on the Rights of the Child, Report on the fortieth session, March 17, 2006, UN Doc. CRC/C/153, para. 665. See also, Committee on the Rights of the Child, Report on the twenty-fifth session, Geneva, November 14, 2000, UN Doc. CRC/C/100, paras. 688.17 and 688.26. 559 Guidelines for the Alternative Care of Children, attached to UN General Assembly Resolution 64/142 , February 24, 2010, UN Doc. A/RES/64/142, para. 21. See also, Committee on the Rights of the Child, Consideration of reports submitted by States parties under article 44 of the Convention. Concluding observations: Latvia, June 28, 2006, CRC/C/15/Add.58, para. 33, and Committee on the Rights of the Child, Report on the fortieth session, March 17, 2006, UN Doc. CRC/C/153, paras. 660 and 667. 560